Question

Qual a massa molar das seguintes substâncias? Dados: H=1, O=16; Ca= 40; N=14;
Na=23.

a) HNO3

b) CaO

c) N2

d) NaOH

Answer 1

$M_{HNO_3} = 1 + 14 + 16 \cdot 3\\M_{HNO_3} = 15 + 48\\\boxed{M_{HNO_3} = 63g/mol}\\\\M_{CaO} = 40 + 16\\\boxed{M_{CaO} = 56g/mol}\\\\M_{N_2} = 14 \cdot 2\\\boxed{M_{N_2} = 28g/mol}\\\\M_{NaOH} = 23 + 16 + 1\\M_{NaOH} = 23 + 17\\\boxed{M_{NaOH} = 40g/mol}$