The same mass of ethane and hydrogen is added to a blank vessel at 25°. What is the fraction of the total pressure exerted by hydrogen?

The same mass of ethane and hydrogen is added to a blank vessel at 25

1.	The same mass of ethane and hydrogen is added to a blank vessel at 25°. What is the fraction of the total pressure exerted by hydrogen?
A.	1 : 2
B.	1 : 1
C.	15 : 16
D.	1 : 16
Answer» D. 1 : 16