I think it's A and B but I'm not good at chem. I remember being asked a similar question and I believe this is correct.
<u>Answer:</u> The amount of time required by chlorine gas to effuse is 19 seconds.
<u>Explanation:</u>
Rate of a gas is defined as the amount of gas displaced in a given amount of time.

To calculate the rate of diffusion of gas, we use Graham's Law.
This law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows the equation:

So,

We are given:
Moles of iodine gas = 0.15 moles
Moles of chlorine gas = 0.15 moles
Time taken by iodine gas = 36 seconds
Molar mass of iodine gas = 254 g/mol
Molar mass of chlorine gas = 71 g/mol
Putting values in above equation, we get:

Hence, the amount of time required by chlorine gas to effuse is 19 seconds.
Answer:
CH₄ + 20₂ → CO₂ + 2H₂O
Explanation:
The reaction equation that supports the law of conservation of mass is the one in which the number of atoms on both sides of the expression are found to be the same.
The law of conservation of mass states that "in a chemical reaction, matter is neither created nor destroyed".
The reaction expressions are given as:
Zn + HCl → ZnCl₂ + H₂
2H₂O → H₂ + O₂
AlCl₃ + H₂O → CH₄ + Al(OH)₃
CH₄ + 20₂ → CO₂ + 2H₂O
In the highlighted reaction above:
Number of atoms
Reactants Products
C 1 1
H 4 4
O 4 4
Answer:
37.14 %
Explanation:
Using the equation, mass, M = D1 * V1
= D2 * V2
Where,
D1 = density of the liquid Nitrogen
D2 = density of gaseous Nitrogen
V1 = volume of the liquid Nitrogen
V2 = volume of the gaseous Nitrogen
Calculating V2,
0.808 * 185 = 1.15 * V2
Volume of Nitrogen after expansion = 129.98 m3.
Volume = L * b * h
= 10 * 10 * 3.5
Volume of the room = 350 m3.
Fraction of air = volume of Nitrogen after expansion/volume of the room * 100
= 129.98/350 *100
= 37.14 %