Test Index

NCERT Class XI Chemistry States of Matter Solutions

© examsnet.com
Question : 18
Total: 23
2.9 g of a gas at 95°C occupied the same volume as 0.184 g of dihydrogen at 17°C, at the same pressure. What is the molar mass of the gas?
Solution:  
Let molar mass of gas = M
Moles of gas(n); =
2.9
M
 , T = 273 + 95 = 368 K ; Since PV = nRT
∴ V =
nRT
P
 =
2.9×R×368
M×P
 ... (1)
Moles of dihydrogen =
0.184
2
 = 0.092 ; T = 273 + 17 = 290 K
∴ Volume of dihydrogen =
0.092×R×290
P
 ... (2)
Since the volume is same,
2.9×R×368
M×P
 =
0.092×R×290
P
∴ M =
2.9×368
0.092×290
 =
1067.9
26.68
 = 40
∴ Thus, molar mass of gas = 40
© examsnet.com
Go to Question:
Prev Question
Next Question