Question

as massas moleculares das substâncias (C9H8O4), (C7H6O3), (C4H6O3) e (H2SO4) são:

a) 180u, 128u, 100u e 76u
b)180u, 138 u, 102u e 98 u
c)180u, 128 u, 100u e 98 u
d)156u, 138 u, 100u e 76 u

Answer 1

Resposta:b)180u, 138 u, 102u e 98 u

Explicação:

C9H8O4--->12.9+1.8+16.4--->108+8+64--->180 g/mol

C7H6O3--->12.7+1.6+16.3--->84+6+48--->138 g/mol

C4H6O3--->12.4+1.6+16.3--->48+6+48--->102 g/mol

H2SO4--->1.2+32.1+16.4--->2+32+64--->98 g/mol