the mole fraction of helium in a gas mixture is 0.16 if the total number of moles of gas in the mixture is 5.2 how many moles of helium are present

Answer 1

The mole fraction of helium in the gas mixture is given as 0.16.

Let x be the moles of helium present in the mixture.

Since the total number of moles of gas in the mixture is 5.2, the moles of other gases (excluding helium) can be calculated as:
Total moles of gas - Moles of helium = 5.2 - x

The mole fraction of helium is given as:
Mole fraction of helium = Moles of helium / Total moles of gas

0.16 = x / 5.2

x = 0.16 * 5.2
x = 0.832

Therefore, there are 0.832 moles of helium present in the gas mixture.