Mass of 7.06 x 10^23 (He) atoms?

The mass is 9,36grams

Explanation:

We use the Avogadro´s Number:

1 mol contains 6, 023x10e23 particles

Weight 1 mol of He= 4, 002602 grams (value obtained from periodic table)

6, 02x10e23 particles4, 002602 grams He

7.06 x 10e23 particlesx=

x=(7.06 x 10e23 particlesx4, 002602 grams He)/6, 02x10e23 particles

x=9, 357076199 grams He

answer; 4 electrons;