Question

question 14 of 30 what is the mass of 5 moles of helium (he) atoms? the periodic table a. 3.01×10²³ g b. 5 g c. 1.20×10²⁵ g d. 20 g

Explanation:

Step1: Find molar mass of helium

The molar mass of helium (He) is approximately 4 g/mol from the periodic - table.

Step2: Calculate mass of 5 moles of helium

We use the formula $m = n\times M$, where $n = 5$ mol (number of moles) and $M = 4$ g/mol (molar mass). So, $m=5\ mol\times4\ g/mol$.
$m = 20$ g

Answer:

D. 20 g