Question

QUESTION 3 0.5 points Save Answer If nitrogen gas has a density of 1.14 g/L, and an unknown gas has a density of 5.67 g/L at the same temp 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 - 2 rate effusion N2 QUESTION 4 0.5 points Save Answer The combustion reaction for octane burning in oxygen is: 2 C8H18 (1) + 25 O2(g) 16 CO2(g) +18 H2O(9) 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 8.95 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) Rate of effusion of a gas is inversely proportional to the square root of its molae mass. rate of effusion (8) & 1 (Grahm's law) Molar mass is proportional to density at same temperature and pressure Therefore 8 Im & ja rate effusion unknown - density of Na rate offusion N₂ Idensity of unknown = 1.14 G/L 5.67 g/L. = 10.201 rate effusion of unknown - 0.45 rate effusion N2