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+
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