The mass of one Avogadro number of helium atoms is?

A. 1.00gram
B. 4.00gram
C. 8.00gram
D. 6.00gram

Correct Answer:

Option B – 4.00gram

Explanation

Avogadro’s number is an absolute number: there are 6.022×10²³ elementary entities in 1 mole.

helium has a molar mass of 4.0 grams per mole. So one mole of helium has a mass of 4.0 grams.