Question

6. 0.157g of a certain gas collected over water
Occupies a volume of 135ml at 27°C and Du
of Hg. Assuming ideal behaviour, the molecular
weight of the gas is (aqueous tension at 27°C 1s
26.7 mm of Hg)
1) 30 2 32 3) 28 4) 16​

Answer 1

Answer:

30g.

Explanation:

The volume given in the question is 135mL. The temperature is given as 27C which in the kelvin scale is given as 300K. While the number of mass is given as 0.157g. The number of moles will be 0.157/M.

So, the pressure at the standard temperature is 750mmHg. So, the pressure will be 750-26.7 which is 723.3 mmHg.

Hence, on applying them in the equation we will get that P1V1 = nRT or 723.3/760 *135/1000 = (0.157/M)*0.0821*300. Which on solving we will get that M will be 30.09g which approximately will be 30g.