Answer:
1.2046*10^24 molecules
Answer:
1.506×1023 molecules
Explanation:
How many atoms and molecules of sulphur are present in 64.0 g of sulphur (S8)? ∴ 64 g of sulphur will contain=6.022×1023×64256=1.506×1023 molecules.
Look at the diagram of a fuel cell below. A fuel cell with 2 vertical objects labeled A and B connected by an electrical wire through a circle with a M in it. There is an area between the two vertical objects labeled A, and substances flowing to, along, and away from the vertical objects and to the left and right. Which statement describes how electrons move if oxidation occurs on the left side of the cell and reduction occurs on the right side? Electrons move from left to right through Electrons move from right to left through A. Electrons move from left to right through M. Electrons move from right to left through M.
The electrons move from left to right through the circle labeled "M" to reach the cathode, where reduction takes place.
If oxidation occurs on the left side of the fuel cell and reduction occurs on the right side, the movement of electrons can be described as follows: Electrons move from left to right through the circle labeled "M."
In a fuel cell, the process of oxidation takes place at the anode (labeled A) where the fuel is oxidized, releasing electrons. These electrons then flow through the external electrical circuit, represented by the wire connecting objects A and B. The electrons reach the cathode (also labeled A) on the right side of the cell, where reduction occurs.The circle labeled "M" represents the membrane or electrolyte in the fuel cell. This membrane allows the transport of ions but blocks the movement of electrons. As a result, electrons cannot flow directly through the electrolyte but must travel through the external circuit.
This movement of electrons through the external circuit is what generates an electric current that can be used to power electrical devices or systems.
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hi how do i do d (ii)? thanks!
A solution with nitrate(V) ion concentrations over 0.05 mg/cm3 has a molarity of around 1.61 x 10-5 mol/L.
We must first convert the amount of nitrate(V) ions in drinking water to moles per litre since the threshold concentration over which "Blue-Baby" Syndrome might manifest is 0.05 mg/cm3.
It is necessary to know the molar mass of nitrate(V) ions in order to convert from mg/cm3 to moles per litre (NO3-).
The formula below can be used to determine NO3-'s molar mass:
N: 14.01 g/mol for the atomic mass
O: 16.00 g/mol is the atomic mass (3 oxygen atoms in NO3-)
NO3-'s total molar mass is equal to 14.01 + 16.00 x 3 = 62.01 g/mol.
Let's now translate the specified concentration from mg/cm3 to moles/liter (M).
As 1 g = 1000 mg, 1 mg/cm3 is 0.001 g/cm3.
1 cm3 = 0.001 g/mL multiplied by 0.001 g/cm3
1 L/1000 mL x 0.001 g/mL = 0.001 g/L
We must change the grams into moles using the molar mass in order to get the molarity:
1.61 × 10-5 mol/L = 0.001 g/L / 62.01 g/mol
As a result, a solution with nitrate(V) ion concentrations over 0.05 mg/cm3 has a molarity of around 1.61 x 10-5 mol/L.
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A population of plants has a mixture of individuals with short, wide flowers and long, narrow flowers. Short, wide flowers are more easily pollinated by bees while long, narrow flowers are more easily pollinated by hummingbirds. Over time, the population becomes dominated by long, narrow flowers.Which statement ,begin emphasis,best,end emphasis, explains the increase in number of plants with long, narrow flowers over time?Answer options with 4 options.The environment favors short, wide flowers instead of long, narrow flowers.B.The gene for short, wide flowers is mutated into a gene for long, narrow flowers.C.Individuals with long, narrow flowers are stronger than individuals with short, wide flowers.D.Individuals with long, narrow flowers produce more seeds than individuals with short, wide flowers.
The best explanation for the increase in the number of plants with long, narrow flowers over time is option D: Individuals with long, narrow flowers produce more seeds than individuals with short, wide flowers.
In this population, short, wide flowers are better suited for bee pollination, while long, narrow flowers are more suitable for hummingbird pollination. Over time, the plants with long, narrow flowers produce more seeds compared to those with short, wide flowers.
This happens because the hummingbirds, which are the main pollinators for long, narrow flowers, are more effective in transferring pollen between these flowers. As a result, the long, narrow flower individuals have a higher reproductive success and pass on their traits to the next generation
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What volume of CO2(g), measured at STP is produced if 15.2 grams of CaCO(s) is heated?
Answer:
Volume = 3.4 L
Explanation:
In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:
CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)
Now, let's calculate the number of moles in 15.2 g CaCO₃:
mole no. = [tex]\mathrm{\frac{mass}{molar \ mass}}[/tex]
= [tex]\frac{15.2}{40.1 + 12 + (16 \times 3)}[/tex]
= 0.1518 moles
From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.
Hence, from the formula for the number of moles of a gas, we can calculate the volume of CO₂:
mole no. = [tex]\mathrm{\frac{Volume \ in \ L}{22.4}}[/tex]
⇒ [tex]0.1518 = \mathrm{\frac{Volume}{22.4}}[/tex]
⇒ Volume = 0.1518 × 22.4
= 3.4 L
Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.
Sally wrote a paragraph about how the carbon cycle might be affected near a volcano. Select the word for each blank to complete her sentences.
Close to the volcano, the carbon dioxide levels could
. This could be good for
, because they require carbon dioxide to grow. Over thousands of years when these organism decay, they could form more
. This part of the carbon cycle is an example of how carbon from the
is used by organisms that eventually become part of the
.
Previous Next
To complete Sally's paragraph of the carbon cycle, the correct words to fill in the blanks are:
increaseplantslimestoneatmosphereHow does carbon cycle work?Close to the volcano, the carbon dioxide levels could increase. This could be good for plants, because they require carbon dioxide to grow. Over thousands of years when these organisms decay, they could form more limestone. This part of the carbon cycle is an example of how carbon from the atmosphere is used by organisms that eventually become part of the lithosphere.
The carbon cycle is a biogeochemical cycle that describes the movement of carbon through the biosphere, geosphere, hydrosphere, and atmosphere. The carbon cycle is one of the most important cycles on Earth, as it is essential for life.
In the paragraph, Sally is describing how the carbon cycle can be affected by volcanoes. When a volcano erupts, it releases carbon dioxide into the atmosphere. This can increase the carbon dioxide levels in the atmosphere, which can be good for plants. Plants use carbon dioxide to photosynthesize, which is the process by which they convert sunlight into energy.
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where do our cells get the molecules they need to function properly
Our cells obtain the molecules they need to function properly from various sources
One important source is our diet. When we eat food, our digestive system breaks it down into smaller molecules that can be absorbed into the bloodstream. These molecules, such as glucose, amino acids, and fatty acids, are then transported to our cells, where they are used as fuel for energy production .
Additionally, our cells can synthesize some molecules on their own. Through processes like photosynthesis in plant cells or biochemical reactions in our body, cells can produce molecules like carbohydrates, lipids, proteins, and nucleic acids.
In summary, cells acquire the molecules they require from the food we eat, as well as through their own synthesis, ensuring they have the necessary resources for proper functioning.
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Answer:
A functioning human body has molecules from food (glucose and amino acids) and molecules from air (oxygen) in its cells.
The thanksgiving luang cave system is estimated to be 35 million cubic meters large. An estimated 250 million liters of water was pumped out of the Dave over the course of the rescue if all the water had remained in the cave system instead of being pumped out what percent of the cave would have been filled with water?
If all the pumped water had remained in the cave system, approximately 71.43% of the cave would have been filled with water.
To calculate the percentage of the Thanksgiving Luang cave system that would have been filled with water if all the pumped water had remained, we need to find the ratio of the volume of water to the total volume of the cave system.Given that the cave system is estimated to be 35 million cubic meters large and 250 million liters of water were pumped out, we need to convert liters to cubic meters. Since 1 liter is equal to 0.001 cubic meters, the pumped water volume in cubic meters is 250 million multiplied by 0.001, which is 250,000 cubic meters.To find the percentage, we divide the volume of water (250,000 cubic meters) by the total volume of the cave system (35 million cubic meters) and multiply by 100.
Percentage = (Volume of water / Total volume of cave system) x 100
= (250,000 / 35,000,000) x 100
≈ 0.7143 x 100
≈ 71.43%
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Which can be excluded from a list of objects in the solar system.
Constellation
Sun
Planet
Asteroid belt
Constellations can be excluded from a list of objects in the solar system.
The correct option is A.
What is the solar system?The solar system refers to the collection of celestial bodies that are gravitationally bound to the Sun. It consists of the Sun, the eight planets namely; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, their moons, asteroids, comets, and other smaller objects.
While constellations are formations of stars as observed from Earth, they are not physical objects within the solar system itself.
The Sun, planets, and the asteroid belt, on the other hand, are all components of the solar system.
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PLEASE HELP
We wish to determine the moles of solid AgCl formed when 50.0 ml of 0.250 M AgNO3 reacts with excess MgCl2 according to the equation below.
2AgNO3(aq) + MgCl2(aq) 2Ag Cl(s) + Mg (NO3)2(aq)
In the previous step you determined 0.0125 mol AgNO3 react. How many moles of AgCl form during the reaction?
The number of moles of AgCl formed during the reaction is 0.0125 mol.
Given the reaction:2AgNO3(aq) + MgCl2(aq) → 2Ag Cl(s) + Mg (NO3)2(aq)We are supposed to determine the moles of solid AgCl formed when 50.0 ml of 0.250 M AgNO3 reacts with excess MgCl2 and in the previous step, we found that 0.0125 mol of AgNO3 reacts.
We can use the stoichiometry method to find the moles of AgCl formed.
To do so, we will have to balance the given chemical equation and find out the number of moles of AgCl formed from the given reactants.
The balanced chemical equation is:2AgNO3(aq) + MgCl2(aq) → 2Ag Cl(s) + Mg (NO3)2(aq)From the equation, we can say that 2 moles of AgCl form from 2 moles of AgNO3 reacted.
In the previous step, we have found the number of moles of AgNO3 reacted, which is 0.0125 mol.
As per the balanced chemical equation, 2 moles of AgCl form from 2 moles of AgNO3 reacted.
Therefore, the number of moles of AgCl formed = (0.0125 mol AgNO3 reacted × 2 moles AgCl / 2 moles AgNO3) = 0.0125 mol AgCl.
The number of moles of AgCl formed during the reaction is 0.0125 mol.
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Which of these pairings with create an octet for each atom?
A. One aluminum atom and one oxygen atom
B. One magnesium and one chlorine
C. One magnesium and one oxygen
D. One potassium and one sulfur atom
Answer:
C) one magnesium and one oxygen
How many grams of F are in 185g CaF2
There are 90.0 g of F are present in 185 g of CaF₂. In chemistry, a mole, usually spelled mol, is a common scientific measurement unit for significant amounts of extremely small objects like atoms, molecules, or other predetermined particles.
According to question, mass of CaF₂ = 185 g
It is required to calculate the moles of CaF₂
Moles of CaF₂ = 185 g / 78.074 g.mol-1
= 2.369 mole of CaF₂
Now find the moles of F from the moles of CaF₂
1 mole of CaF₂ = 2 moles of F
2.369 mole of CaF₂ = ?
= 4.74 moles of F
Now change the mole to gram of F
Mass of F = 4.74 moles of F × 18.998 g/mol
= 90.03 g of F
Thus, 90.0 g of F are in 185 g of CaF₂.
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How many grams of water (H2O , GFW = 18.02 g/mol) will be produced when 35.8 grams of calcium hydroxide (Ca(OH),
„GFW = 74.10 g/mol) reacts with hydrochloric acid?
17.42 grams of water (H₂O) will be produced when 35.8 grams of calcium hydroxide (Ca(OH)₂) reacts with hydrochloric acid.
Given,
Mass of calcium hydroxide (Ca(OH)₂) = 35.8 grams
Molar mass of calcium hydroxide (Ca(OH)₂) = 74.10 g/mol
Molar mass of water (H₂O) = 18.02 g/mol
The balanced equation for the reaction between calcium hydroxide and hydrochloric acid is: Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O
For every 1 mole of calcium hydroxide that reacts, 2 moles of water are produced.
Moles = Mass / Molar mass
Moles of Ca(OH)₂ = 35.8/ 74.10 ≈ 0.483 mol
Moles of H₂O = 2 × Moles of Ca(OH)₂ = 2 × 0.483 = 0.966 mol
Mass = Moles × Molar mass
Mass of H₂O = 0.966 × 18.02 ≈ 17.42
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I need help on this Chem problem
Four Hydrogen atoms are present in the molecule (Furan) shown below.
Furan is a heterocyclic organic compound with a five-membered ring containing four carbon atoms and one oxygen atom. It has the chemical formula C4H4O. Furan is a colorless, volatile liquid with a distinctive aromatic odor. Coal tar and organic material burning make it.
Furan is utilised in resins, polymers, and solvents. Furan is poisonous and carcinogenic, hence its use and exposure must be carefully controlled.
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Write the equilibrium expression for the following reaction. CaO(s) + CH₄(g) + 2H₂O(g) —> CaCO₃(s) + 4H₂(g)
The equilibrium expression can be written as follows:
K = [CaCO₃] × [H₂]⁴
------------------
[CaO] × [CH₄] × [H₂O]²
In this equilibrium expression, the square brackets represent the concentrations of the species involved in the reaction, and the coefficients of the balanced equation indicate the stoichiometric coefficients of the corresponding species.
The concentration of a pure solid (CaCO₃ in this case) is not included in the equilibrium expression, as it remains constant throughout the reaction.
The equilibrium constant (K) represents the ratio of the product concentrations to the reactant concentrations at equilibrium, each raised to the power of their respective stoichiometric coefficients. The specific values of these concentrations depend on the initial conditions, and K remains constant as long as the temperature is unchanged.
It is important to note that the equilibrium constant expression is written based on the balanced chemical equation. The stoichiometric coefficients determine the relationship between the concentrations of reactants and products, allowing us to express the equilibrium state quantitatively using the equilibrium expression.
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For the reaction
2NH3(g)↽−−⇀ 3H2(g)+N2(g)
the equilibrium concentrations were found to be [NH3]=0.250 M, [H2]=0.470 M, and [N2]=0.800 M. What is the equilibrium constant for this reaction?
eq=
Rounding to the appropriate number of significant figures, the equilibrium constant (Kc) for the reaction is approximately 1.66.
To calculate the equilibrium constant (Kc) for the given reaction, we can use the formula:
Kc = ([H2]^3 * [N2]) / [NH3]^2
Plugging in the given equilibrium concentrations, we have:
Kc = (0.470^3 * 0.800) / (0.250^2)
Calculating the numerator:
(0.470^3 * 0.800) = 0.1037032
Calculating the denominator:
(0.250^2) = 0.0625
Now, dividing the numerator by the denominator:
Kc = 0.1037032 / 0.0625 = 1.6592512
The equilibrium constant represents the ratio of the concentrations of products to reactants at equilibrium. In this case, the equilibrium constant is greater than 1, indicating that the products (H2 and N2) are favored at equilibrium. This means that the forward reaction is favored, leading to the formation of more products compared to reactants.The equilibrium constant value of 1.66 suggests that the forward reaction is moderately favored at equilibrium, but without additional context, it is difficult to determine the extent of the reaction or the relative concentrations of reactants and products at the beginning of the reaction.
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Which gas has the higher boiling point and why? - Help!
Question 6 options:
Neon, because it has more protons.
Neon, because it has more electrons and has a stable filled octet.
Hydrogen, because it has a smaller size.
Hydrogen, because it has a lower molar mass.
Explanation:
4 th option is the correct oneYour Brainly Guide
•which energy source would be most economical
for the community to use?
OA. Hydroelectric
OB. Fossil fuels
OC. Nuclear
Hydroelectric energy source would be most economical for the community to use. The correct option is A.
Thus, the most cost-effective energy source for a town will often rely on a number of variables, including infrastructure, accessibility, and regional circumstances. However, hydroelectric electricity often has a better long-term cost-effectiveness and environmental impact.
Once the equipment is in place, hydroelectric power uses the energy of moving or falling water to produce electricity, making it a relatively cheap and renewable form of energy. Although fossil fuels may initially be less expensive, their supplies are limited, and they also contribute to pollution and climate change.
Thus, the ideal selection is option A.
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Place a test tube in the test tube rack, and label it 3. Then follow these steps using your prepared solution:
1. Use the pipette to remove copper(II) sulfate solution from the volumetric flask, and measure out 10 milliliters in the
graduated cylinder. Transfer the 10 milliliters of solution from the graduated cylinder to test tube 3.
2. Record the temperature of the solution in the table provided.
3. Measure 0.25 gram of zinc powder into a weighing boat.
4. Pour the zinc powder into test tube 3.
5. Measure the final temperature of the solution in test tube 3. Watch the thermometer for a couple of minutes, and
record the highest temperature it reaches.
6. Calculate and record the difference of the initial and final temperatures in the table.
B I y x² X, 10pt
AVV EEEEE 図 √ 田
Measurement
Initial temperature (°C)
Final temperature (°C)
Temperature change (°C)
V
Answer
Based on the provided steps, we are conducting an experiment involving copper(II) sulfate solution and zinc powder. We are measuring the temperature change that occurs when zinc reacts with copper(II) sulfate.
Measurement:
Initial temperature (°C): This is the temperature of the copper(II) sulfate solution before adding zinc powder. Use a thermometer to measure and record this temperature.
Final temperature (°C): This is the highest temperature reached by the solution after adding the zinc powder and allowing the reaction to occur. Watch the thermometer for a couple of minutes and record the highest temperature observed.
Temperature change (°C): Calculate the difference between the initial and final temperatures. Subtract the initial temperature from the final temperature and record the result as the temperature change.
Follow the steps provided to carry out the experiment and record the corresponding measurements in the table. Make sure to use the pipette to transfer 10 milliliters of copper(II) sulfate solution to test tube 3, then add 0.25 grams of zinc powder to the test tube.
Monitor the temperature using a thermometer and record the initial and final temperatures accurately. Finally, calculate the temperature change by subtracting the initial temperature from the final temperature and record the value in the table.
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Determine the volume of Hydrogen gas collected over water from the reaction of
25.6g of Magnesium reacting with 45.0g of Hydrochloric acid to make magnesium
chloride and hydrogen gas. The gas is collected at 785.4 torr and 36.5 C. The vapor
pressure of water at 36.5C is 47.1 mmHg.
The volume of hydrogen gas collected over water is approximately 25.10 liters. We need to consider the stoichiometry of the reaction, the ideal gas law, and the partial pressure of hydrogen gas.
First, let's balance the equation for the reaction between magnesium (Mg) and hydrochloric acid (HCl):
Mg + 2HCl -> MgCl₂ + H₂
From the balanced equation, we can see that 1 mole of magnesium reacts to produce 1 mole of hydrogen gas.
1. Calculate the number of moles of magnesium (Mg):
Molar mass of Mg = 24.31 g/mol
Number of moles of Mg = Mass of Mg / Molar mass of Mg = 25.6 g / 24.31 g/mol = 1.054 mol
2. Calculate the number of moles of hydrogen gas (H₂):
Number of moles of H₂ = Number of moles of Mg = 1.054 mol
3. Apply the ideal gas law to calculate the volume of hydrogen gas (V₂):
PV = nRT
Given:
Pressure (P) = 785.4 torr
Temperature (T) = 36.5 °C = 36.5 + 273.15 K = 309.65 K
R = 0.0821 L·atm/(mol·K) (gas constant)
Number of moles (n) = 1.054 mol
Convert the pressure to atm:
785.4 torr = 785.4 torr * (1 atm / 760 torr) = 1.032 atm
Substituting the values into the ideal gas law equation:
V₂ = (nRT) / P = (1.054 mol * 0.0821 L·atm/(mol·K) * 309.65 K) / 1.032 atm ≈ 25.10 L
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For the reaction
4PH3(g)↽−−⇀6H2(g)+P4(g)
the equilibrium concentrations were found to be [PH3]=0.250 M, [H2]=0.580 M, and [P4]=0.750 M.
What is the equilibrium constant for this reaction?
c=
The equilibrium constant for the given reaction is approximately 25.199.
To determine the equilibrium constant for the given reaction, we can use the concentrations of the species at equilibrium. The equilibrium constant (Kc) is defined as the ratio of the product concentrations raised to their stoichiometric coefficients divided by the ratio of the reactant concentrations raised to their stoichiometric coefficients.
The balanced equation for the reaction is:
4PH3(g) ↔ 6H2(g) + P4(g)
Using the concentrations given at equilibrium, we can substitute the values into the equilibrium expression:
Kc = ([H2]^6 * [P4]) / ([PH3]^4)
Plugging in the given concentrations:
Kc = ([0.580 M]^6 * [0.750 M]) / ([0.250 M]^4)
Kc = (0.1311 * 0.750) / (0.00390625)
Kc ≈ 25.199
This value indicates that at equilibrium, the product concentrations are favored over the reactant concentrations, as Kc is greater than 1.
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For this assignment, you will be creating your own potential energy diagrams for three chemical reactions. Then you will use your diagrams to find the value of △H for each reaction.
By analyzing the potential energy diagrams and calculating ΔH using bond energies, we can determine whether a reaction is exothermic (ΔH < 0) or endothermic (ΔH > 0).
To create potential energy diagrams for chemical reactions and determine the value of ΔH (the change in enthalpy) for each reaction, we need to understand the basic concepts and steps involved.
Potential Energy Diagram: A potential energy diagram is a graphical representation of the energy changes that occur during a chemical reaction. The vertical axis represents the potential energy, while the horizontal axis represents the progress of the reaction.
Reactants and Products: Identify the reactants and products involved in each reaction. Assign them appropriate labels on the potential energy diagram.
Activation Energy: Determine the activation energy (Ea) for each reaction. It represents the energy barrier that must be overcome for the reaction to occur. On the diagram, the reactants' energy level is typically higher than the products' energy level, with the activation energy peak in between.
Transition State: Locate the highest point on the potential energy diagram, which represents the transition state or activated complex. This point indicates the highest energy level during the reaction.
ΔH Determination: ΔH represents the difference in enthalpy between the reactants and products. It can be determined by examining the vertical distance between the reactants' energy level and the products' energy level on the potential energy diagram.
ΔH Calculation: ΔH can be calculated using the formula ΔH = Σ (bond energies of reactants) - Σ (bond energies of products). The bond energies are the energy required to break a particular bond or released when a bond is formed.
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