t0 6. What is the molecular weight of a gas that effuses 1.84 times faster that
ID: 1042707 • Letter: T
Question
t0 6. What is the molecular weight of a gas that effuses 1.84 times faster that la(g) under the same conditions? 7. Dry air at STP (O°C and 1.00 atm pressure) has a density of 1.2929g/L. What is the average molecular weight of the molecules that compose air? 8. Give an example of the units that might be used for: a)specific heat b) heat capacity c) d) the "m" in q-CmAT AH n 9. When an endothermic reaction occurs in a calorimeter (True or False): the calorimeter warms _ the sign of ??.n is positive. the sign of qnn is negative. the reaction absorbs heat. 10. A 150.0-g sample of metal at 80.0°C is added to 150.0 g of H 0 at 20.0°C. The temperature rises to 23.3°C. Assuming that the calorimeter is a perfect insulator, what is the specific heat of the metal? 11. The initial temperature of a calorimeter containing 100.g of water was 24.5°C. What is the final temperature of the water after the calorimeter absorbs 1.00kJ of heat energy?Explanation / Answer
Ans 6
Graham's law
Effusion rate is inversely proportional to the square root of molecular weight of the gas
r1/r2 = (M2/M1)0.5
Molecular weight of unknown gas = M2
Molecular weight of I2 gas = M1 = 253.81
rate for I2 = 1.0
(1/1.84)2= M2/253.81
M2 = 74.97
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