Question

How many protons are there in 6.0 g of nitrogen gas? Avogadro constant, L = 6.022 × 1023 mol–1

Answer 1

M = 28.01 g/mol

6.0 / 28.01 = 0.2142 mol

0.2142 mol x L = 0.2142 mol x 6.022 × 10²³ mol^–1

= 1.3 x 10²³ molecules of N2

Each molecule contains 7 protons (atomic number 7)

7 x 1.3 x 10²³ = 9.0 x 10²³ p⁺