Question

Calcule a massa molar das seguintes substâncias abaixo. Sabendo que H = 1u, Na = 23u, O = 16u, N = 14

18 g/mol, 20 g /mol e 39 g /mol
18 g/mol, 40 g /mol e 63 g /mol
18 g /mol, 19 g /mol, 60 g /mol

Answer 1

Explicação:

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Calculando as massas molares:

$H_{2}O:\\\\M=2.H+O\\\\M=2.1+16\\\\M=2+16\\\\\boxed{\boxed{M=18g/mol}}$

$NaOH:\\\\M=Na+O+H\\\\M=23+16+1\\\\\boxed{\boxed{M=40g/mol}}$

$HNO_{3} \\\\M=H+N+3.O\\\\M=1+14+3.16\\\\M=1+14+48\\\\\boxed{\boxed{M=63g/mol}}$

Answer 2

Resposta:18 g/mol, 40 g /mol e 63 g /mol

Explicação:

H2O--->1.2+16.1--->2+16--->18 g/mol

NaOH--->23.1+16.1+1.1--->23+16+1--->40 g/mol

HNO3--->1.1+14.1+16.3--->1+14+48--->63 g/mol