Question

1. If nitrogen gas has a density of 1.14 g/L, and an unknown gas has a density of 4.2 g/L at the same temperature and pressure, what is the ratio of the rate of effusion of the known gas to the rate of effusion of nitrogen?

2. The combustion reaction for octane burning in oxygen is:

2 C₈H₁₈ (l) + 25 O₂(g) →  16 CO₂(g) +18 H₂O(g)   ∆H = -10869 kJ .

Suppose an oxygen bomb calorimeter is loaded with oxygen gas and excess octane.  
The oxygen gas has a volume of 480.0 mL, pressure of 7.7 atm, and an initial temperature of 22.1 °C.  
The calorimeter has a heat capacity of 1.75 kJ/ °C .  
Assuming the oxygen reacts completely, what is the final temperature of the calorimeter?

QUESTION 3 If nitrogen gas has a density of 1.14 g/L, and an unknown gas has a density of 4.2 g/L at the same temperature and pressure, what is the ratio of the rate of effusion of the known gas to the rate of effusion of nitrogen? rate effusion unknown rate effusion N2 QUESTION 4 The combustion reaction for octane burning in oxygen is: 2 C8H18 (1) + 25 O2(g) → 16 CO2(g) +18 H2O(g) AH = -10869 kJ. Suppose an oxygen bomb calorimeter is loaded with oxygen gas and excess octane. The oxygen gas has a volume of 480.0 mL, pressure of 7.7 atm, and an initial temperature of 22.1 °C. The calorimeter has a heat capacity of 1.75 kJ/ °C Assuming the oxygen reacts completely, what is the final temperature of the calorimeter?

Answer 1

1) According to Grahams law of diffusion, rate of effusion of agas isinversely proportional to square root of the denisty of the gas at constant temperature and pressure. Fortwo gasses, 1 Density of N, gas, d, = 1.14 g/L Rate of effusion of N, gas = 11 Density of unknown gas, d, = 4.2 g/L Rate of effusion of unknown gas = 2 According to Grahams equation, 1 = 12 4.2 g/L = 1.9 V1.14 g/L 1 -1.9 m 1 1