# Dalton’s law Worksheet

Dalton’s law states that, “The total pressure exerted by a gaseous mixture is equal to the sum of the pressure of the parts.”

Mathematical formula to explain Dalton’s law :

PressureTotal = Pressure 1 + pressure2 + Pressuren

In this article you can find some questions related to Dalton’s law and graham’s law of Diffusion with their answers:

Questions:

1. Three gases A, B, C are enclosed in a container and have partial pressures as $p_1, p_2, p_3$ respectively at T Kelvin. The total pressure at T Kelvin will be:

(a)    always equal to $(P_1 + P_2 + P_3)$

(b)   equal to $(P_1 + P_2 + P_3)$only if gases do not react with one another

(c)    greater than $(P_1 + P_2 + P_3)$

(d)   less than $(P_1 + P_2 + P_3)$

2. Under similar conditions which of the following gases will diffuse four times as quickly as oxygen?

(a)    He

(b)   $H_2$

(c)    $N_2$

(d)   $CH_4$

3. Which of the following gases is heavier than dry air?

(a)    Pure $N_2$

(b)   Pure $Cl_2$

(c)    Moist air

(d)   All of these

4. Which expression gives the rates of diffusion of two gases at same temperature but different pressure?

(a)    $\dfrac{r_1}{r_2} = \dfrac{\sqrt{P_1} d_1}{\sqrt{P_1} d_2}$

(b)   $\dfrac{r_1}{r_2} = \dfrac{P_1}{P_2} \dfrac{\sqrt{d_2}}{\sqrt{d_1}}$

(c)    $\dfrac{r_1}{r_2} = \dfrac{P_2}{P_1} \dfrac{\sqrt{d_2}}{\sqrt{d_1}}$

(d)   $\dfrac{r_1}{r_2} = \dfrac{P_1^2}{P_2^2} \dfrac{\sqrt{d_1}}{\sqrt{d_2}}$

5. A gas diffuses at twice the rate of that of oxygen under same conditions of temperature and pressure. The molecular mass of the gas will be:

(a)    64

(b)   8

(c)    16

(d)   2