Mole ConceptHard

Question

The composition of universe is approximately 90% hydrogen and 10% helium, by mass. It represents that

Options

A.There are 18 hydrogen atoms in the universe per atom of helium.
B.There are 9 hydrogen atoms in the universe per atom of helium.
C.There are 36 hydrogen atoms in the universe per atom of helium.
D.The average molar mass of universe is 2.105 g per mole.

Solution

Moles of H-atoms = $\frac{90}{1}$= 90

Moles of He-atoms = $\frac{10}{4}$= 2.5

∴ NH: NHe = 90: 2.5 = 36: 1

and Mav =$\frac{100}{\frac{90}{2} + \frac{10}{4}}$= 2.105

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