Question

1. Cate grame cantaresc 10 kmoli H2 ?
2.Cati moli reprezinta 284 kg P2O5 ?

Answer 1

Răspuns:

1. MH2=2×AH=2×1=2g/kmoli

$n = \frac{m}{m \: mare} \\ m = n \times m \: mare = 10kmol \times \frac{2g}{kmol} = 20g$

2. 284 kg P2O5= 284000g

MP2O5=AP×2+AO×5= 2×31+5×16= 62+80= 142g/mol

$n = \frac{284000g}{ 142g/mol } = 2000moli$