Question

Calculate the number of moles in 84 grams of helium

Answer 1

No of moles = given mass ÷ molecular mass
no of moles= 84÷ 4
no of moles= 21 units

Answer 2

Answer:

The number of moles in 84 grams of helium is 21.

Explanation:

Mole can be defined as amount of substance is a measure of how many basic units of a particular substance are in an object or sample. 6.022 × 10²³ elementary entities are there in one mole of a substance.

Formula of mole= $\frac{given mass}{molar mass}$

Given mass = 84 grams

molar mass = 4 grams

∴ No. of moles =$\frac{84}{4}$

=21

#SPJ3