Question

How many grams of O2 are in 5.0 moles of the oxygen gas?

Answer 1

A sample of oxygen gas had a volume of 2.50 L at STP.

Answer 2

Answer : The mass of oxygen is 160 grams.

Solution : Given,

Moles of $O_2$ = 5 moles

Molar mass of $O_2$ = 32 g/mole

Formula used :

$\text{ Mass of }O_2=\text{ Moles of }O_2\times \text{ Molar mass of }O_2$

$\text{ Mass of }O_2=(5moles)\times (32g/mole)$

$\text{ Mass of }O_2=160g$

Therefore, 160 grams of $O_2$ are in 5.0 moles of the oxygen gas.