Using Speed, distance and time relation, the distance is 400 kilometers.
Distance is the sum of an object's movements, regardless of direction. Distance can be defined as the amount of space an object has covered, regardless of its starting or ending position.
The International System of Units defines a metre as the distance unit. It's interesting to note that many other derived units or quantities, such as volume, area, acceleration, and speed, may be constructed using this as the basic unit and a few formulae.
20 kilometers per hour is the speed per half-hour.
⇒ Speed in kilometers per hour: 40 × 2 = 80
Distance x time = speed
Distance = Time × Speed
= 80 × 5
= 400 miles
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In a chemical reaction, 2400kJ per mole of reactants is absorbed when bonds are broken. 3200kJ per mole of products is released when bonds are made. What is the enthalpy change for this reaction?
The enthalpy change for the chemical reaction in which 2400kJ per mole of reactants is absorbed when bonds are broken and 3200kJ per mole of products is released when bonds are made is -800 kJ.
What is the enthalpy of a reaction?The enthalpy change of a chemical reaction that takes place at constant pressure is known as the Heat of Reaction (also known as the Enthalpy of Reaction). It is a thermodynamic unit of measurement that can be used to determine how much energy is released or created per mole during a reaction.
Enthalpy change = sum of bond energies of reactants - sum of bond energies of products
Enthalpy change of the reaction = 2400 - 3200 kJ
Enthalpy change of the reaction = -800 kJ
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how many grams of water are produced when 44 grams of propane react?
When 44 grams of propane reacts, 72.0 g of water is produced.
The molar mass of propane (C₃H₈) is 44 g/mol and that of water (H₂O) is 18 g/mol.
44.0 grams of propane is equivalent to 1 mole of propane.
According to the balanced chemical equation,
C₃H₈+ 5O₂ → 3CO₂ + 4H₂O
1 mole of propane produces 4 moles of water.
So, burning 44.0 g (1 mol) of propane will produce 4 moles of water.
Mass of water = moles x molar mass
Mass of water = 4 × 18 = 72.0 g.
So, the mass of water is 72.0 g.
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which of the given purposes is the tlc method most often used for?
TLC method is mostly often used for the qualitative as well as quantitative sample analysis.
TLC (Thin layer chromatography) is an affinity based method which is used to separate the compounds present in a mixture. TLC is a highly versatile separation method which is widely used for both qualitative as well as quantitative sample analysis. It can be used to analyze the virtually any substance class, including steroids, alkaloids, lipids, nucleotides, glycosides, carbohydrates, as well as fatty acids.
Thin Layer Chromatography is that technique which will be used to isolate the non-volatile mixtures. The experiment is conducted on a sheet of the aluminum foil, glass or plastic which is coated with a thin layer of adsorbent material. The material which is usually used i.e aluminum oxide, silica gel or cellulose. After completion of the separation, each component will appears as spots and separated vertically.
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what mineral might contribute to hypertension if eaten in excess?
The main minerals that may contribute to hypertension when consumed in excess include sodium, potassium, and calcium.
Eating too much of certain minerals can lead to hypertension, a condition that can cause high blood pressure.
Too much sodium can cause the body to retain water, leading to increased blood pressure.
Potassium can also affect blood pressure, as it influences the amount of sodium in the body.
Calcium is important for regulating the contraction and relaxation of muscles, including those of the heart. When calcium levels become too high or excess, it may lead to hypertension.
Therefore, it is important to keep an eye on your mineral intake to ensure that it remains within healthy limits.
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recycling plant needs to separate two types of
plastic: ABS, d = 1.15 g/mL and PET, d = 1.35 g/mL. Would a solution of NaCI with a density of
1.05 g/mL be able to separate them? A. No, the two plastics will not be separated because both types would sink when added to
the solution of NaCI. B. No, the two plastics will not be separated because both types would float when added to
the solution of NaCI. C. Yes, the two plastics will be separated because ABS would sink and PET would float when
added to the solution of NaCI. D. Yes, the two plastics will be separated because ABS would float and PET would sink when
added to the solution of NaCI.
The recycling plant needs to separate two types of plastic: ABS, d = 1.15 g/mL and PET, d = 1.35 g/mL. No, the two plastics will not be separated because both types would sink when added to the solution of NaCI. Therefore, option A is correct.
What do you mean by density ?The term density is defined as the ration of mass and volume. It is represented by the formula as follows:
Density = Mass / Volume
If an object is denser than NaCl solution, then it will sink when placed in solution, and if it is less dense than NaCl solution, it will float.
The densities of both ABS and PET are more than the density of NaCl solution, Therefore both will sink in the NaCl solution.
Thus, option A is correct.
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URGENT!!! from september 1 to june 1, the number of daylight hours observed each day in new york state will...
From september 1 to june 1, the number of daylight hours observed each day in new york state will be option A: Decrease only.
What is the daylight about?The number of daylight hours observed each day in New York State will go down. This is due to the earth's tilt on its axis and its orbit around the sun, which causes the amount of daylight to change throughout the year.
In the northern hemisphere, the fall and winter months have shorter daylight hours than the spring and summer months. On September 1st, it is the start of fall, which means the days will start getting shorter.
Therefore, As we move towards June 1st, the days will continue to get shorter until we reach the shortest daylight hours of the year on the winter solstice (around December 21st or 22nd), after that the days will start getting longer again.
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How many chromosomes do you receive from your mother and your father?
Answer: Under normal conditions. Each cell in the human body has 23 pairs of chromosomes (46 in total). Half come from the mother and half from the father.
Explanation: Chromosomes are transferred in pairs.
Under normal conditions. Each cell in the human body has 23 pairs of chromosomes (46 in total). Half come from the mother and half from the father.
Two of these chromosomes (the X and the Y chromosome) determine one’s sex as male or female. They are called sex chromosomes:
• Females have 2 X chromosomes.
• Males have 1 X and 1 Y chromosome.
The mother gives an X chromosome to the child. The father may contribute either X or Y. The chromosome from the father determines if the baby is born male or female.
The remaining chromosomes are called autosomal chromosomes (22 pairs).
1 chromosome from mother+ 1 chromosome from father+ 22 pair autosomal chromosomes= 46
Answer:
We inherit a set of 23 chromosomes from our mothers and another set of 23 from our fathers. One of those pairs are the chromosomes that determine the biological sex of a child – girls have an XX pair and boys have an XY pair, with very rare exceptions in certain disorders.
If two atoms that have the same mass number must have the same. True or False?
Answer: False
Explanation:
Every atom of an element will have the same number of protons in its nucleus. This is how we set apart different elements. Therefore, if two elements were to have the same mass numbers but different atomic numbers, they cannot be considered atoms of the same element
if you use too much hot solvent when dissolving your crude compound, how will that impact the recovery of your compound and why?
Recrystalization will occur.The solution may become too diluted for crystals to form if you add too much solvent. Impurities will be captured by a hastily formed crystal's lattice. The crystals that result will also be smaller.
What is Recrystalization?Recrystallization is a physical process used to separate compounds based on how soluble they are. Heating the material to dissolve the compound with impurities in a mixture of a suitable solvent completes the procedure. We can remove the desired chemical or contaminants from the mixture using this method.
The solution may become too diluted for crystals to form if you add too much solvent. The flask needs to be gently cooled, first at room temperature and then in cold water. Impurities will be captured by a hastily formed crystal's lattice. The resulting crystals will also be smaller.
This method is used to harden steel in order to eliminate all strain hardening side effects, including the significant plastic deformation brought on by cold working.The crystals that frequently form when the compound precipitates out gave it its name. The natural expansion of larger ice crystals at the expense of smaller ones is another definition of recrystallization.Some commonly effective mixes include diethyl ether-methanol (or ethanol) for polar molecules (particularly esters, alcohols, and hydrocarbons) and diethyl ether-petroleum ether (or benzene) for strongly linked solids (notably amides, alcohols), as well as many natural products.The three main types of recrystallization are;
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Which of the following CANNOT weigh 1 amu? Why?
a. Atoms because they always weigh more than 1 amu
b. Electrons because they are the lightest subatomic particle
c. Protons because they always weigh more than 1 amu
d. Neutrons because they don't have any mass
Answer: Electrons
Explanation: Electrons are much smaller than Protons and Neutrons. Protons and neutrons each weigh about 1 amu.
How many phases does the moon have?
- I know the answer but yea
particle derives its name from the fact that it has no electrical charge; it is neutral and found in the nucleus of an atom____
Because it is electrically neutral and can be found in the nucleus of an atom, this particle is known as a neutron. The nucleus contains the neutron, an elementary particle.
Except the atom of pure hydrogen. The fact that the particle has no charge and is electrically neutral gives rise to its name. Neutrons have the highest density. Every atom's nucleus, with the exception of basic hydrogen, is home to a neutron, a subatomic particle. The fact that the particle has no charge and is electrically neutral gives rise to its name. Neutrons have the highest density. Hydrogen is a chemical element with atomic number 1 and the letter H. Hydrogen is the lightest element.
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Determine the number of moles P4(s) in a 2.0 gram sample.
Answer:
0.016 moles
Explanation: Because you are doing P4, you take the molar mass/atomic mass of phosphorous which is 30,97(rounded up) and multiply it by 4 since that's the subscript. Then you take 2.0 grams and divide it by the molar mass, which is 123.88, and that gives you 0.016 moles (rounded up)
An apple placed in a sealed
container has a mass of 160
grams. What would the mass of
the apple be after 6 weeks of
decomposition?
A. 160 grams
B. 80 grams
C. 40 grams
The apple weighs 80 grams after 6 weeks of deterioration. The correct answer is option (B).
Does decomposition lose mass?More recalcitrant chemicals are degraded in the latter stages of breakdown. Decomposition reactions occur when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input. Simply put, mass is a measurement of a body's amount of matter. Matter is everything that has both volume and mass.
Although not linearly, the overall percentage of decomposition was highly correlated with carcass mass. A particle's or an object's mass is a dimensionless number that indicates how much matter is present. The kilogram serves as the standard mass unit in the International System (SI).
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Answer:
the correct answer is A.
Explanation:
In the activity series, the more active elements are found
(a) at the bottom
(b) in the middle
(c) at the top
(d) both (a) and (c)
Answer:
Number three the answer is d
insulators are different than conductors in that insulators
a. do not contain electrons or protons b. have a weaker affinity for electrons c. do not contain any charge
d. do not allow charge to freely move
The correct answer is D. Conductors have more free electrons as compared to insulators.
There are two different types of substances on the basis of their electrical properties: conductors and insulators. Conductors are those that can pass electricity through it. Example: Water. Insulators are those which cannot pass the electricity or the electric motion through themselves. Example: air. This is because the no of free electrons that will carry the charge is more in the case of conductors. Charges in insulators are restricted to one position only which made it suitable for wire coatings.
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rank the species (carbonate chloride iodate and sulfate) from most to least soluble
The order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride. Carbonates are the most soluble.
What is solubility?The maximum amount of a material that may dissolve in another is known as its solubility. A saturated solution is created when a solvent can dissolve its maximum quantity of solute before reaching equilibrium. A supersaturated solution results when extra solutes are dissolved past its equilibrium solubility point under specific circumstances.
Dissolution is the action of disintegrating. In contrast to the speed of solution, which specifies how rapidly a molecule dissolves in a solvent, solubility is not a feature of matter. The order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride.
Therefore, the order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride.
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Analyze Data In the figure to the left, write the charge of the oxygen atom and the oxygen ion. Write the charge to the left of the word "charge."
The image that is shown is the gain of two electrons by the oxygen atom.
What is an ion?We have to note that when we talk about the term "ion" we are talking about such a specie that can be formed by the loss or gain of electrons. Thus an ion is positive if it formed by the loss of electrons and the ion is negative if it is formed by the gain of electrons.
In the case of the image that we have here, we can see that there is again of two electrons by the oxygen atom and this is how we form the oxygen ion that has ten electrons and eight protons.
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Select all intermolecular forces that contribute to creating a solution of KBr in H20. a.lon-dipole b.London Dispersion c.H-bonding d.Dipole-Dipole
The intermolecular forces that contribute to creating a solution of [tex]KBr[/tex] in [tex]H_2O[/tex] are Ion-Dipole Intermolecular force and H-Bonding.
[tex]KBr[/tex] is an ionic compound, which contains potassium ions ([tex]K^+[/tex]) as cations and Bromide ions ([tex]Br^-[/tex]) as anions.
On the other hand, [tex]H_2O[/tex] is a polar compound. In [tex]H_2O[/tex], as the electronegativity of oxygen is much greater than that of hydrogen, the oxygen atom attracts the electrons of the covalent bond towards itself. Therefore, hydrogen atoms get partially positive and oxygen atom gets partially negative.
Hence, when [tex]KBr[/tex] is added to water, there is an Ion-Dipole intermolecular force acting in between them.
It is also true that bromine is highly electronegative as compared to hydrogen. Thus, there will be the formation of hydrogen bonding in between [tex]KBr[/tex] and [tex]H_2O[/tex].
Hence, The intermolecular forces that contribute to creating a solution of [tex]KBr[/tex] in [tex]H_2O[/tex] are Ion-Dipole Intermolecular force and H-Bonding.
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Pleaseee help now ASAP please
Diphosphorus trichloride has a phosphorus content of 22.554%. Phosphorus is indeed a mineral that can be found in many foods naturally as well as in supplements. It has a number of functions in the body. It is a crucial component of cell membranes, bones, and teeth.
What occurs if you have a high phosphorus level?Frequently, high phosphorus does not result in any symptoms. On the other hand, an excess of phosphorous in your blood can result in calcium loss from your bones and other body tissues, resulting in low calcium levels (also called hypocalcemia). Low calcium levels do result in symptoms like: tense muscles
Does phosphorous hurt people?Severe vomiting & diarrhea, both of which are characterized as "burning," "luminescent," and with a garlic-like odor, are frequently brought on by ingestion of basic white or yellow phosphorus. Dysrhythmias, comas, hypotension, and even death are potential additional symptoms of severe poisoning.
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A drop taken from the top of a mixture of alt and water will jot be identical to a drop taken from the bottom of the mixture
A drop taken from the top of a solution of salt and water will not be identical to a drop taken from the bottom of the mixture because the salt and water molecules will be distributed differently throughout the mixture.
What is a solution?
A solution is a homogeneous mixture of two or more substances. In a solution, the solute, which is the substance that is dissolved, is evenly dispersed throughout the solvent, which is the substance that the solute is dissolved in.
Salt is denser than water, so it will tend to settle to the bottom of the mixture over time. This means that a drop taken from the top of the mixture will have a lower concentration of salt than a drop taken from the bottom.
Additionally, due to the process of diffusion, the salt molecules will tend to move from areas of higher concentration to areas of lower concentration, so the concentration of salt will be different at different points throughout the mixture. Therefore, a drop taken from the top will have less salt concentration than a drop taken from the bottom.
Therefore, as the salt and water molecules are distributed differently throughout the mixture a drop from the solution will be identical to that of the bottom of the jar.
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Drag each label into the appropriate position to identify which chemical classification it describes. - Steroid - Peptide 1. Utize CAMP DAG, or IP3 systems 2. Bind to receptors in the cells nucleus 3. Require a transport protein 4. Hydrophobic 5. Pass directly through the plasma membrane 6. Hydrophilic 7. Elicit responses over several hours to days 8. Elicit responses almost immediately 9. Require second 10. Bind to membrane bound receptors messenger systems
Peptides are hydrophilic, elicit immediate responses, require secondary messenger systems and binds to membrane bound receptors whereas steroids are hydrophobic, requires a transport proteins, binds to the receptors which are present on the nucleus of the cell.
Steroids are hydrophobic in nature and due to this hydrophobic nature, they are able to pass through the plasma membrane directly. They bind to the receptors which are present in the nucleus and not on the plasma membrane. They do not elicit response immediately but take several hours to even days.
Peptides being hydrophilic cannot cross the plasma membrane directly. They bind to the receptors which are present on the plasma membrane. They use the DAG, cAMP or IP3 systems.
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What name is given to substances (both soluble and insoluble) such as metal hydroxides and metal oxides that can neutralise acids?
The name given to the substance such as metal hydroxides and metal oxides that can nuetralise acids is Base or Alkali.
A base is a proton-accepting molecule or ion, according to chemists. That makes OH- a base. They continue to refer to bases dissolved in water as "alkali." Sodium hydroxide, for example, dissolves in water and separates into Na+ and OH-ions. The result is an alkali, and it is a source of the base OH-.
Some properties of bases are given below:
Bases taste bitter Bases release a hydroxide ion in a water solution.Bases neutralise acids in a neutralisation reaction Bases denature protein Bases turn red litmus to blueLearn more about bases here:
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Scientists are developing new methods of conservation to preserve species in danger of extinction. Captive breeding programs try to restore the population of a species. Germ plasm is any form of genetic material contained in reproductive or germ cells or plants and animals. Germ plasm banks also knowns as gene banks save sperm, egg or DNA. Farmers also save germ seeds to replant seeds of plants.
13. One way scientists save species in danger of extinction is by:
A logging tropical rain forests
B developing new methods of conservation
C removing species from endangered lists
D abandoning new methods of conservation
Answer:
B. Developing new methods of conservation
Explanation:
Such as the Germ Plasm in the excerpt. This is an example of new conservation methodology
Part B
It's time to get started. Fill the plastic bottle to the brim with water. Then pour
graduated cylinder or other measuring tool to measure the total capacity of th
may need to fill the measuring tool multiple times. To recall how to use a grad
video on measuring volume before continuing.
If you are using household measuring tools, use these conversions to record t
bottle in milliliters (mL). Visit the math review for help with converting units
• 1 cup = 240 mL
1 tablespoon = 15 mL
●
• 1 teaspoon = 5 mL
What is the capacity of the bottle in milliliters?
W
Gradually graduated cylinders are available in a variety of sizes, or volume capacities, and, like a measuring cup, are used to determine volume by pouring liquid to the cylinder and comparing the liquid level to the graduated scale. The volume that was measured is the same as the amount of liquid that was put inside the cylinder.
How to measure the volume of a liquid using graduated cylinder?Similar to weighing, determining the volume of a liquid is a fundamental and common lab procedure.Both a graduated cylinder and a burette are commonly used to measure liquid volume.A graded cylinder is, as its name suggests, a cylindrical glass or plastic tube that is sealed at one end and has a calibrated scale etched (or marked) on its exterior. Gradually graduated cylinders are available in a variety of sizes, or volume capacities, and, like a measuring cup, are used to determine volume by pouring liquid to the cylinder and comparing the liquid level to the graduated scale. The volume that was measured is the same as the amount of liquid that was put inside the cylinder. As a result, the graduated cylinder and similar apparatus (volumetric flasks, Erlenmeyer flasks, and beakers) are categorized as to-contain (TC) apparatus.The Complete Question is graduated cylinders.
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Gradually graduated cylinders are available in a range of diameters, or volume capacities, and, like a measuring cup, are used to calculate volume by pouring liquid into the cylinder and comparing the liquid level to the graduated scale.
How can I use a graduated cylinder to determine a liquid's volume?The measurement of a liquid's volume is a fundamental and frequent lab process, similar to weighing.The volume that was calculated matches the liquid volume that was placed inside the cylinder.Liquid volume is often measured using a graduated cylinder or a burette.Gradually graduated cylinders are available in a range of diameters, or volume capacities, and, like a measuring cup, are used to calculate volume by pouring liquid into the cylinder and comparing the liquid level to the graduated scale.The volume that was calculated matches the liquid volume that was placed inside the cylinder.Thus, the graduated cylinder and related equipment (volumetric flasks, Erlenmeyer flasks, and beakers) are referred to as to-contain (TC) apparatus.The complete question is,
Graduated cylinders represent .
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b) During the reaction, 10.60 cm³ of gas is produced in 40.0 s.
Calculate the mean rate of reaction during this time. Include units
Answer:45000
Explanation:
construct an explanation for how genetic code is related to the traits of an organism, how these changes occur, and what effects these changes can have on an organism.
Answer:
Genetic code consists of a sequence of nucleotides which are the building blocks of DNA. Each nucleotide contains a four-letter code, which is used to construct proteins in the organism. These proteins are responsible for the physical and behavioral traits of the organism. Changes in the genetic code can occur through mutation, which is when a mistake is made in the nucleotide sequence during DNA replication. This can lead to changes in the proteins and the traits of the organism. Some of these changes can be beneficial, while others can be harmful. Ultimately, the effects of these genetic changes depend on the environment in which the organism lives and the type of change that has occurred.
1. Three scientists measure the standard meter bar kept at the International Bureau of Standards. Their measurements are 1.09 m, 1.09 m, and 1.08 m. Are their measurements accurate, precise, or both? Why?
Answer:
both
Explanation:
The three scientists' measurements are both accurate and precise.
Accuracy refers to how close a measurement is to the true value, and precision refers to how close multiple measurements are to each other.
In this case, the measurements are accurate because they are all very close to the true value of the standard meter bar, which is defined as 1 meter.
The measurements are precise because all the measurements are very close to each other. They are all within 0.01 m of each other, indicating that the scientists are able to consistently measure the same length, indicating that they are precise in their measurements.
It's worth noting that, even though the measurements are accurate and precise, it's still possible to have a small measurement error, this is because the true value of the standard meter is not 1.09 m or 1.08 m, but the International System of Units defined it to be exactly 1m, and the difference between the measurements and the true value is very small.
The measurements provided by the three scientists are precise but not accurate.
Explanation:The measurements provided by the three scientists can be analyzed in terms of accuracy and precision. Accuracy refers to how close the measured values are to the true value, while precision refers to how close the measured values are to each other. In this case, the measured values are 1.09 m, 1.09 m, and 1.08 m. These measurements are not accurate because they are not equal to the true value of a standard meter bar, which is 1.00 m. However, they are precise because they are very close to each other.
Although the measurements are not accurate, they are consistent with each other, indicating precision in the measurements. In scientific experiments, it is important to have both accuracy and precision. Accurate measurements ensure that the measurement is close to the true value, while precise measurements establish consistency and reliability in the experiment results.
In conclusion, the measurements provided by the scientists are precise but not accurate.
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Explain how two species can directly compete for the same resource when they are in contact with one another . Describe one example to show direct competition.
Two species can directly compete for the same resource when they are in contact with one another such as for food, space, mates, or water.
One example of direct competition is two lions competing for a mate.
What is competition among organisms?Competition can be described as the direct or indirect contact of organisms that results in a change in fitness when the organisms share a resource.
Competition is most commonly thought of as the interaction of individuals that compete for a common resource that is in limited supply.
Individuals who directly compete with one another for the same resource are said to be in direct competition.
Some examples of competition are:
Plants compete with one another for growing space, soil nutrients, pollinators, temperature, humidity, and light exposure. Competition among microbes for chemical substrates.Learn more about direct competition at: https://brainly.com/question/17143746
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How many molecules are the in 1.8g of water molecule H2O
The number of the molecules of water is 1.8 g is 6.02 * 10^22 molecules.
What are the molecules?We can be able to obtain the molecules from the Avogadro's number. We know that the number of the molecules that we find in the compound can be gotten by the use of the proposition that was put forward by Avogadro.
Number of moles of the water = 1.8g/18 g/mol = 0.1 moles
We know that;
1 mole of water contains 6.02 * 10^23 molecules of water
0.1 moles of water would contain 0.1 mole * 6.02 * 10^23 molecules/ 1 mole
= 6.02 * 10^22 molecules
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