Question

Rhea has a balloon that contains 0.5 mole of helium. how many particles of helium are in the balloon?

Answer 1

Answer:

$\boxed{3 \times 10^{23}}$

Explanation:

1 mol of helium contains 6.022 × 10²³ atoms

$\text{Atoms of He} =\text{0.5 mol He} \times \dfrac{ 6.022 \times 10^{23} \text{ atoms He}}{\text{1 mol He}}= 3 \times 10^{23} \text{ atoms He}$

The balloon contains $\boxed{3 \times 10^{23} \text{ atoms of He}}$.