If a sample has an initial mass of 4.48 grams and undergoes decay until it has a mass of 0.140 grams, then option b 3 half-lifes passed
The half-life of a substance is the amount of time it takes for half of the initial sample to decay. For cobalt-60, the half-life is 5.26 years. This means that if we start with 4.48 grams of cobalt-60, half of that (2.24 grams) will remain after 5.26 years.
The remaining 2.24 grams will then decay until half of that (1.12 grams) remains after another 5.26 years. Continuing this pattern, we can see that after 3 half-lives (15.78 years), we will be left with 0.140 grams of cobalt-60. Therefore, the sample underwent decay for 3 half-lives.
Half-life, in chemistry, is the time required for half of the original number of radioactive atoms in a sample to decay. The half-life of a radioactive substance is a measure of the stability of the nucleus of the atom.
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Neutralization of 1 liter of a solution containing 1,4 g of
KOH requires 50 cm³of an acid solution. Calculate the
normality of the acid solution.
(Answer: 0,53 n.) how?
The normality of the acid solution is 0.53N.
What is Neutralization?The process by which an acid and a base neutralize one another. As a result of their reaction, an acid and a base produce heat as well as salt and water.
To calculate the normality of the acid solution, you need to know the number of moles of acid used in the neutralization reaction. Since the volume of the acid solution is given in cm³ and the molarity (normality) is in moles per liter, you will first need to convert the volume to liters.
1 cm³ = 0.001 liters
So, 50 cm³ = 0.05 liters
To find the number of moles of acid used, divide the volume in liters by the molarity:
moles acid = volume acid/molarity acid
Next, you can use the balanced equation for the neutralization reaction between KOH and the acid to find the number of moles of KOH that reacted.
1 mole KOH = 1 mole H+
The number of moles of KOH is 1.4/56.11
moles acid = volume acid / molarity acid = 0.05 / (1.4/56.11)
molarity acid = 0.05 / (1.4/56.11) = 0.53 n.
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A sample of gold required 3.25 x 104 J of heat to melt it from
room temperature, 23.2°C, to its melting point, 1064.4°C. How
many pounds of gold were in the sample?
According to the question, 0.55 lb many pounds of gold were in the sample of heat to melt it from room temperature.
What is heat?
Heat is the transfer of energy from one object to another due to the temperature difference between them. Heat is the form of energy that is transferred between two objects with different temperatures. Heat moves from the object with the higher temperature to the object with the lower temperature. Heat is also created when an object does work, such as friction or compression. Heat transfer can happen through conduction, convection, and radiation. Conduction occurs when two objects of different temperatures are in direct contact with each other.
The specific heat of gold is 0.128 J/g°C.
3.25 x 104 J = (3.25 x 104 J) / (0.128 J/g°C x 841.2°C)
= 2.5 x 103 g
2.5 x 103 g = (2.5 x 103 g) / (453.6 g/lb)
= 0.55 lb of gold
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A compound melts at 20°C.
What kind of structure do you think it has?
The compound is non polar covalent in its structure as said above.
What is the melting point?Let us recall that the melting point has to do with the temperature at which there is the conversion of the solid to a liquid. We know that the melting point of the compound would depend on the structure of the compound.
If the compound would have a melting point that is about 20°C, the implication is that the compound is not be held by very strong intermolecular forces hence it must be covalent.
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Byron is a goal had always been to complete
Byron's goal had always been to compete in the Olympics as a runner. He had told all his family and friends, and he was dedicated to his dream: Byron's goal was to run in the Olympics.
What was the Olympics' primary objective?A four-year carnival of world sports is the Olympic Games. The ultimate objectives are to develop people through sport and promote peace in the globe. Winter Games and Summer Games are different events.Byron was an odd creature; because of his fatalistic outlook on life, he let fate govern him and therefore did whatever he pleased, regardless of what other people thought or said about him. He believed he could do whatever he wanted because he was one of the most famous and decadent poets of his day (he even had a pet bear at his university!).Every four years, the Olympic Games bring together athletes from throughout the world.To learn more about Byron's goal refer to:
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(a) Carefully complete the energy diagram by drawing a curve that accurately shows the progress of the reaction, beginning at the reactants, moving through the transition state, and ending at the final products. When adding the products to the diagram, be sure to use an energy level that is appropriate relative to the energy level of the reactants.
(b) On your energy diagram, draw a dashed curve to show the reaction progress from reactants to products in the presence of a suitable catalyst for the reaction.
(c) On your energy diagram, draw a vertical line segment with a length that corresponds to the activation energy for the reverse uncatalyzed reaction: 2HI(g)→H2(g)+I2(g)
The energy diagram of the given reaction shows that, the activation energy of the reactants is less than that of the products. The transition state is having the highest activation energy.
What is endothermic reaction :An endothermic reaction is the reaction in which the reactants will absorb heat energy from the surroundings. The reactants will gain sufficient energy to overcome the barrier potential of the reaction and thereby they have less activation energy.
The given reaction of the decomposition of hydrogen iodide is an endothermic reaction. Hence, HI has the least activation energy and the products hydrogen gas and iodine gas have the higher activation potential as shown in the diagram.
The activation energy of the transition state is indicated with the central arrow,
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This compound gives off some gold sparks in a flame test. With Sodium Hydroxide or Ammonia, an orange brown precipitate forms. If NaOH and aluminum are added and the compound is warmed, red litmus paper will turn blue and an odor will be produced. Determine the name and formula of this compound.
Iron hydroxide is the compound that gives off some gold sparks in a flame test and the chemical formula of the compound is Fe(OH)₃.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
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Given the reaction: H2 + O2 = HOH How many grams of hydrogen gas are needed to produce 11.2 moles of water vapor?
Answer: 22.6g H2
Explanation:
You need to set up dimensional analysis starting with 11.2moles of H2O (the same as HOH).
First, you need to balance the equation. When balanced, it is:
2H2(g) + O2(g) --> 2H2O(g)
Starting with moles of H2O, you need to go from moles of H2O to moles of H2. To do so, you need to use the mole ratio that you can figure out from the balanced equation. In this case it will be 2mol H2/2mol H2O.
Then just convert to grams using the molar mass of H2 which is 2.016grams.
11.2 mol H2O x (2 mol H2 / 2 mol H2O) x (2.016g H2 / 1 mol H2) = 22.6g H2
When that equation is set up, all units except for grams of H2 will cancel and you'll be able to multiply across.
which of the following liquids would have the highest viscosity at the same temperature? group of answer choices A. h2nch2ch2nh2 B. ch3ch2cl C. ch3ch2ch2nh2 D. c2h5oc2h5
C₂H₅OC₂H₅ (Diethyl ether) has the highest viscosity at same temperature.
The order of viscosity possessed by the different fluids at same temperature is given below.
C₂H₅OC₂H₅ (Diethyl ether)
H₂NCH₂CH₂NH₂ (Ethylene diamine)
CH₃CH₂Cl (Chloroethane)
CH₃CH₂CH₂NH₂ (propan-1-amine)
All the above molecules form hydrogen bonding. As, the viscosity could be directly related to hydrogen bonding tendency, ethylene diamine will be more viscous at a given temperature, as it could form hydrogen bonding through two NH₂ groups.
Viscosity is defined as the resistance of a fluid (liquid or gas) to a change in shape, or movement of neighboring portions relative to one another. Viscosity represents opposition to flow. The reciprocal of the viscosity is defined as the fluidity, a measure of the ease of flow.
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Which coordinates represent a point that is on the new line?
(2,0), This point is on the new line because it can be represented by the equation y=2x, which is the equation of the new line.
What is equation?An equation is a mathematical statement that expresses the equality of two expressions. It establishes a relationship between the two expressions and shows that they are the same. An equation can contain any number of variables, ranging from zero to infinity. It can be used to solve problems involving unknown values, using a set of algebraic operations such as addition, subtraction, multiplication, division, and exponentiation. Equations can also be used to represent relationships between physical quantities, allowing us to understand how one quantity changes in relation to another. Equations are used in many fields, from engineering and science to economics and finance.
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"Dark Gray had the most consistent temperature at 88°F" Which BEST explains why this a weak evidence statement? "Dark Gray had the most consistent temperature at 88°F" Which BEST explains why this a weak evidence statement? The evidence statement is based on bad/incorrect data. The evidence statement is untrue. The evidence statement is extra information that doesn't help answer the question. The evidence statement contains reasoning. The evidence statement contains a claim.
Answer:
the evidence statement contains reasoning.
Explanation:
the reason that this piece of information is reasoning rather than evidence is because it doesn't tell us the temperatures of the other substances (if any.) if we look at this substance and it has the most constant temperature compared to the others, how will we know if it is the most constant if we don't know the other substances' data?
this is reasoning because the evidence should tell us more about the substance and the others.
Which example is a biotic factor of an aquarium environment?
Responses
amount of oxygen in the water
water temperature
amount of sand in the aquarium
number of underwater plants
To solve this we must be knowing each and every concept related to environment. Therefore, the correct option is option B among all the given options.
What is environment?An environment may be simply defined as a system that includes all abiotic and biotic components that have an impact on human life. All flora and animals are considered biotic, or living, elements, whereas water, sunshine, air, temperature, etc. are considered abiotic.
Any good, service, or feature that benefits people and society might be considered one of an environment's resources. They might be anything that fulfills a person's requirements on a daily basis. Amount of oxygen in the water is a biotic factor of an aquarium environment.
Therefore, the correct option is option B.
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Answer: B: Water Temperature
Explanation: k12 test 1.04 Science Life semester 2
hydrogen reacts with 32g of oxygen to produce 34g of hydrogen peroxide . how many grams of reactants were reacted
Answer: 32g of oxygen and 4g of hydrogen were reacted in total.
Explanation:
To find out how many grams of reactants were reacted, we need to use the balanced equation of the reaction. The equation for the reaction between hydrogen and oxygen to produce hydrogen peroxide is:
2H2 + O2 --> 2H2O2
From the equation, we know that the reaction involves 2 moles of hydrogen and 1 mole of oxygen. We can use the balanced equation to determine the stoichiometry of the reaction, which tells us the relative number of moles of each reactant and product.
We know that 32g of oxygen was reacted, and since 1 mole of oxygen is equal to 16g, we can calculate the number of moles of oxygen by:
32g / 16g = 2 moles
We know that 2 moles of hydrogen are required for every mole of oxygen. so the number of moles of hydrogen is also 2 moles.
We know that 1 mole of hydrogen is equal to 2g, so we can calculate the number of grams of hydrogen by:
2 moles x 2g = 4g
Therefore, 32g of oxygen and 4g of hydrogen were reacted in total.
help for 20 points please
Answer:
hi
Explanation:
Which statement about the population shown in this graph is true?
There is nothing controlling population growth.
The population is not continuing to grow because it has reached its carrying capacity.
The number of individuals will continue to increase rapidly.
The number of individuals will decrease until there are none left.
The correct statement about the population shown in this graph is
The population is not continuing to grow because it has reached its carrying capacity.
What is population?Population typically refers to the number of people in a single area, whether it be a city or town, region, country, continent, or the world.
The carrying capacity of an environment is described as the maximum population size of a biological species that can be sustained by that specific environment, given the food, habitat, water, and other resources available.
The purpose of Carrying capacity is that it is a concept for biologists when trying to better understand biological populations and the factors that affect them.
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When a solution goes through a flame test, a lilac flame is produced, and the solution does not react with NaOH or NH3. When mixed with silver nitrate, a cream colored precipitate is formed. Determine the name and formula for the compound in this solution.
Answer: Potassium bromide, KBr
Explanation:
Potassium gives a lilac flame in flame test and Bromide ions produce a cream precipitate when they react with Silver ions to form Silver bromide
Step 7: Put the metal in the water and measure temperature changes (Copper)
Initial temperature of metal
=
°C
Initial temperature of water
=
C
Final temperature of both =
DONE
Below is a list of the temperature change solution.
Temperature Change: What Is It?The source of the temperature change is
Initial Temperature - Final Temperature
Temperature measurements
It is a gauge for determining how hot or chilly a body is.
To quantify temperature variations,
The water and iron's beginning and final temperatures are noted.
To Iron
Iron that has been heated up is submerged in water.
Water is at a lower temperature, so both of the temperatures will change.
These information is saved.
Final temperature minus initial temperature equals temperature change.
a) The difference in temperature for metal is 200 - 100 = 100 0C
Water temperature change = 22.5
Change in temperature for both = 23.3
b) 0.7 for water
Metal 76.6 for iron
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Complete Question -
Put the Metal in the Water and Measure
Temperature Changes (Lead)
Measure the initial temperature of the water to the
nearest 0.1°C. Record in the data table.
Initial temperature of metal =
Initial temperature of water
Final temperature of both = [
27
DONE
26
25
24
23
Intro
Continue
AL
250 ml
=பா-©
200
150
100
1
27
O
°C
°C
A raindrop has a mass of 0.041 g. How many moles of water does a raindrop contain?
Answer: 0.0023mol
Explanation:
Molar Mass of Water is 18.01g/mol
0.041g H2O*(mol/18.01g) = 0.0023mol
Mg(s) + Ni2+(ag) -> Mg2+ (aq) + Ni(s) What is the total number of moles of electrons lost by Mg(s) when 2.0 moles of electrons are gained by Ni2+(ag)? * 10 ( 1.0 mol ,20 mol ,3.0 mol, 4.0 mol
The total number of moles of electrons lost by Mg(s) when 2.0 moles of electrons are gained by Ni2+(ag) is also 2.0 moles of electrons.
How to find the number of moles?This is because in a chemical equation, the number of moles of electrons gained by the reducing agent (in this case Ni2+) is equal to the number of moles of electrons lost by the oxidizing agent (in this case Mg(s)).
In this redox reaction, Mg is being oxidized because it loses electrons and Ni is being reduced because it gains electrons. The oxidation and reduction process are occurring simultaneously, so the number of electrons lost by Mg(s) is equal to the number of electrons gained by Ni2+(ag).
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The electrons that are gained by the [tex]Ni^{2+}[/tex] ion is 2.0 moles of electrons.
What is the number of the electrons gained?We know that when there is a redox reaction, there would be the loss or gain of electrons in the process. The process is a simultaneous one so the electrons that are lost by one specie must as a matter of necessity be gained by another specie.
In this case, as we look at the reaction equation we can see that there are two electrons that have been lost by the magnesium atom and these two electrons would be gained by the Nickel II ion.
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How are atoms of sodium and chlorine similar and different from one another?
Answer:
similar as they both have valency of 1
different as sodium is metal while chlorine is non metal
Calculate a length of copper wire having a diameter of 0.200 cm and a mass of 15.620 g. The density of copper is 8.92 g/cm3.
The density of the the wire is given 8.92 g/cm³. The mass is 0.200 cm. Thus, length of the copper wire will be 55.7 cm.
What is density ?Density of a substance is the measure of its mass per unit volume. It describes how closely its particles are packed within a given volume. It is the ratio of mass to the volume.
Volume of an object is the space occupied by the object. For a rectangle block, volume is the product of length, width and height.
volume of wire = πr²l
diameter = 0.200 cm
radius = 0.1 cm
volume = 3.14 × (0.1)² l = 0.0314 l
where l is the length of the wire.
Mass of the wire = 15.62 g
density = mass/ volume
d = 15.62 g/ 0.0314 l cm³
= 8.92 g/cm³
Then, l = 55.7 cm.
Therefore, the length of the copper wire is 55.7 cm.
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How many moles in 68 grams of so2? (Show work pls)
The number of mole in 68 grams of sulphur dioxide, SO₂ is 1.06 mole
How do I determine the number of mole of SO₂?The number of mole of a substance is defined by the following formula:
Mole = mass / molar mass
Using the above fromula, we can obtain the number of mole in 68 grams of sulphur dioxide, SO₂. This is shown below:
Mass of SO₂ = 68 grams Molar mass of sulphur = 32 g/mol Molar mass of O = 16 g/molMolar mass of SO₂ = 32 + (2 × 16) = 32 + 32 = 64 g/molNumber of mole of SO₂ =?Mole = mass / molar mass
Number of mole of SO₂ = 68 / 64
Number of mole of SO₂ = 1.06 mole
Thus, we can conclude that the number of mole is 1.06 mole
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What chemicals have a saturation contraction less than 5m but greater than 2m
Answer: Sodium and Chlorine
Explanation: I think it's right
when burning magnesium is lowered in a gas jar full of carbon 4 oxide it continued to burn explain
When burning magnesium is lowered in a gas jar full of carbon dioxide, the burning process continues because the carbon dioxide acts as an oxidizing agent.
What is a combustion reaction?A combustion reaction is a type of chemical reaction that occurs when a fuel, such as a hydrocarbon, reacts with an oxidizing agent, such as oxygen, to produce heat and light in the form of a flame. The basic equation for a combustion reaction is:
Fuel + Oxidant → Heat + Light + Products
In the case of burning magnesium, the fuel is magnesium and the oxidant is carbon dioxide. The products of the reaction are magnesium oxide and carbon dioxide. Combustion reactions are exothermic, meaning they release energy in the form of heat.
This means that the carbon dioxide provides the oxygen necessary for the combustion reaction to continue, allowing the magnesium to continue burning. Additionally, the carbon dioxide also helps to extinguish the flame by removing the heat and the oxygen from the combustion zone.
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How are atoms of sodium and chlorine similar and different from one another?
Answer:
Explanation:
Atoms of sodium and chlorine are both elements, meaning they are made up of only one type of atom. Both have an atomic number of 11, which means they have 11 protons in their nucleus, but the number of neutrons and electrons differ. Sodium has 12 neutrons and 11 electrons, while chlorine has 17 neutrons and 17 electrons.
Atoms of sodium and chlorine are also both reactive, meaning they form chemical bonds with other elements. However, sodium is more reactive than chlorine, which is why it often forms compounds with other elements, such as sodium chloride (NaCl).
Atoms of sodium and chlorine are also similar in that they both have the same number of electrons in their outer shells. This means they can both form two covalent bonds with other elements. However, because the number of electrons and neutrons in each atom is different, the strength of the bonds they form will differ.
Overall, atoms of sodium and chlorine are similar in that they both have 11 protons and can form two covalent bonds, but they differ in their number of neutrons and electrons, which affects the strength of the bonds they form and their reactivity.
mass of N in 0.464g of N2H4
To find the mass of Nitrogen (N) in 0.464 grams of N2H4 (hydrazine), we need to use the molar mass of N2H4 and the proportion of Nitrogen in the compound.
First, the molar mass of N2H4 is (14.01 + 2(14.01) + 4(1.01)) = 32.05 g/mol.
Next, we know that the proportion of Nitrogen in N2H4 is 2 moles of Nitrogen to 1 mole of N2H4, or 2/1.
So, to find the mass of Nitrogen in 0.464 grams of N2H4, we can use the following formula:
Mass of Nitrogen = (mass of N2H4) x (proportion of Nitrogen) / (molar mass of N2H4)
Plugging in the values:
Mass of Nitrogen = (0.464 g) x (2/1) / (32.05 g/mol)
Mass of Nitrogen = 0.028 grams
Therefore, the mass of Nitrogen in 0.464 grams of N2H4 is 0.028 grams.
Glucose (C6H12O6) is burned in the human body for energy. Carbon dioxide and water are produced as waste products. How many moles of oxygen are needed to combust 3.12 moles of glucose?
18.72 moles of oxygen are needed to combust 3.12 moles of glucose.
Glucose is a type of sugar that can be represented by the chemical formula C6H12O6.
When glucose is burned in the human body, it combines with oxygen to form carbon dioxide (CO2) and water (H2O) as waste products.
The balanced equation for the combustion of glucose is:
C6H12O6 + 6O2 -> 6CO2 + 6H2O
From the equation, we can see that for every 1 mole of glucose, 6 moles of oxygen are needed.
To calculate the number of moles of oxygen needed to combust 3.12 moles of glucose, we can use this relationship;-
3.12 moles of glucose * 6 moles of O2/1 mole of glucose = 18.72 moles of O2
So, 18.72 moles of oxygen are needed to combust 3.12 moles of glucose.
1. Determine the phase or phases in a system consisting of H₂O at the following conditions and sketch p-v and T-v diagrams showing the location of each state. (a) p=5 bar, T = 151.9 °C. (b) p = 5 MPa, T = 264 °C (c) T 180 °C, 0.9 MPa (d)) p = 20 MPa, T = 100 °C (e) T-10 °C, 1.0 kPa
We will utilise the water belongings tables from every state. Tables A-three, A-2, and A-five are used.
outline temperature ?
Temperature is a bodily amount that expresses quantitatively the
of hotness and coldness.
Part a
T = 179.nine and P = 10 br
Tables display that the T saturated is in addition 179.nine; hence, H20 exists as a two-segment liquid-vapor combination. Tsat-P = Tsat-P
See attachment 1 for similarly statistics on p-v and T-v.
Part b
T = one hundred fifty and P = 10 br
Tables display that the saturated T is 179.nine, implying that H20 exists withinside the sub-cooled liquid area. T. Tsat-P
Attachment 2 carries statistics on p-v and T-v.
Part c
P = 0.five br and T = one hundred ranges Celsius
According to temperature tables, the P saturated is 1.014 bar; hence, H20 exists withinside the super-heated area. Psat-T. Table A-2
Attachment three carries statistics on p-v and T-v.
Part d
P = 50 br and T = 20 ranges Celsius
According to temperature tables, the P saturated is 0.02339 bar; hence, H20 exists withinside the sub-cooled liquid area. Psat-T > Psat. A-2, Table
Attachment four carries statistics on p-v and T-v.
Part e
T = -6 C and P = 1 bar
According to temperature tables, the P saturated is 0.003689 br; hence, the H20 P > Psat-T strong due to the fact T is much less than the triple factor temperature. A5 Table
See
five for similarly statistics on p-v and T-v.
We will utilise the water property tables from each state. Tables A-3, A-2, and A-5 are used.
define temperature ?
Temperature is a physical quantity that expresses quantitatively the perceptions of hotness and coldness.
Part a
T = 179.9 and P = 10 br
Tables show that the T saturated is similarly 179.9; hence, H20 exists as a two-phase liquid-vapor combination. Tsat-P = Tsat-P
See attachment 1 for further information on p-v and T-v.
Part b
T = 150 and P = 10 br
Tables show that the saturated T is 179.9, implying that H20 exists in the sub-cooled liquid area. T. Tsat-P
Attachment 2 contains information on p-v and T-v.
Part c
P = 0.5 br and T = 100 degrees Celsius
According to temperature tables, the P saturated is 1.014 bar; hence, H20 exists in the super-heated area. Psat-T. Table A-2
Attachment 3 contains information on p-v and T-v.
Part d
P = 50 br and T = 20 degrees Celsius
According to temperature tables, the P saturated is 0.02339 bar; hence, H20 exists in the sub-cooled liquid area. Psat-T > Psat. A-2, Table
Attachment 4 contains information on p-v and T-v.
Part e
T = -6 C and P = 1 bar
According to temperature tables, the P saturated is 0.003689 br; hence, the H20 P > Psat-T solid because T is less than the triple point temperature. A5 Table
See 5 for further information on p-v and T-v.
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reaction [1] 54.2079 Set H Q.No. 20 OR:-
An unsaturared hydrocarbon (C3H6) undergoes Markovnikov's rule to give (A). Compound (A) is hydrolysed with aqueous alkali to yield (B). When (B) is treated with PBr3, compound (C) is produced. (C) reacts with AgCN (alc.) to give another compound (D). The compound (D) if reduced with LiAlH4, produce (E).
i. Define Markovnikov's rule.
ii. Identify (A), (B), (C), (D) and (E) with chemical reaction.
iii. How does E react with nitrous acid? iv.How would you convert (B) into C3H8? [1+5+1+1]
An unsaturated hydrocarbon propene undergoes Markovnikov's rule to give (A) 2- bromo, propane is formed. 2- bromo, propane is hydrolyzed with aqueous alkali to yield (B) propane is produced.
What is Markovnikov's rule ?Markovnikov's rule states that when an asymmetrical substance is added to an asymmetrical alkene, then the negative part of the reagent will attach to the carbon atom containing less number of hydrogen atoms.
An unsaturated hydrocarbon propene undergoes Markovnikov's rule to give (A) 2- bromo, propane is formed. 2- bromo, propane is hydrolyzed with aqueous alkali to yield (B) propane is produced. When propane is treated with PBr3, compound (C) 1, bromo- propane is produced. 1, bromo- propane reacts with AgCN (alc.) to give another compound (D) 1 cyano propane. The compound (D) if reduced with LiAlH4, produce (E) propane.
When E react with nitrous acid nitro propane is formed.
Thus, 2- bromo, propane is hydrolyzed with aqueous alkali to yield (B) propane is produced.
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Write the thermochemical equation of the reaction
between CO (g) and hydrogen, as a result of which CH4 (g) and
H₂O (g) are formed. How much heat will be released during this
reaction if 67.2 liters of methane were obtained in terms of
normal conditions?
The thermochemical equation of the reaction is CO (g) + 3H₂ (g) ⇒ CH₄ + H₂O. 48 KJ heat will be released during this reaction if 67.2 liters of methane.
What is thermochemical equation ?A balanced stoichiometric chemical equation that includes the enthalpy change i.e, ΔH is called as thermochemical equation.
At STP,
1 mole of any gas occupies a volume of 22.4 L.
The volume of 67.2 L corresponds to 67.2 / 22.
= 3 moles.
1 mole of CO₂ obtained from 1 mole of methane.
3 moles of CH₄ will be obtained from 3 moles of CO₂.
The molar mass of methane = 16 g/mol.
Then, the mass of 3 moles of methane = 3 × 16
= 48 KJ
Thus,The thermochemical equation of the reaction is CO (g) + 3H₂ (g) ⇒ CH₄ + H₂O. 48 KJ heat will be released during this reaction if 67.2 liters of methane.
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If 1 gram of radium decays to 1/2 gram in 1622 Years so, 6 grams decay to 3 grams in
a)9732 years
b) 3244 years
c) 4866 years
d) 1622years
Answer:
Explanation:
Since 1 gram of radium decays to 1/2 gram in 1622 years that means the half-life of radium is 1622 years.
So, 6 grams also decay to 3 grams in 1622years
