Question

To prevent a condition called the “bends”, deep sea divers breathe a mixture containing, in mole percent, 10.0% O2, 10.0% N2 , and 80.0% He.

a. Calculate the molar mass of this mixture.
b. What is the ratio of the density of this gas to that of pure Oxygen?

Answer 1

1. In order to prevent the condition called “bends”. He needs to calculate the Molar Mass of the mixture of 10.0% 02, 10.0 % N2 and 80 % He.
So the Answer is letter A. Calculate the molar mass of this mixture.
How to calculate:
Given Numbers : 10.0 % O2
10.0% N2
80 % He
Molar Mass = (.10 x 32g / mol.) + (.10 x 28g / mol.) + (.80 x 4g / mol.)
=> 9.2g / mol.