How many atoms are present in 8.00g of He?

1.20 × 10²⁴ atoms He

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

8.00 g He

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of He - 4.00 g/mol

Step 3: Convert

= 1.2044 × 10²⁴ atoms He

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

1.2044 × 10²⁴ atoms He ≈ 1.20 × 10²⁴ atoms He

2b2t

explanation:

2b2t