Question

Assinale a alternativa que indica, respectivamente, as massas moleculares corretas das substâncias abaixo:
A)100 u, 68 u, 40 u e 380 u.
B)98 u, 40 u, 64 u e 400 u.
C)98 u, 64 u, 40 u e 400 u.
D)82 u, 80 u, 40 u e 400 u.
E)98 u, 64 u, 39 u e 208u.

Answer 1

Resposta:C)98 u, 64 u, 80 u, 40 u e 400 u.

Explicação:

H2SO3--->1.2+32.1+16.4--->2+32+64--->98 g/mol

SO2--->32.1+16.2--->32+32--->64 g/mol

SO3--->32.1+16.3--->32+48--->80 g/mol

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

Fe2(SO4)3--->56.2+32.3+16.12--->112+96+192--->400 g/mol