Question

cum se calculeaza masa de substanta din 3 moli  H2O

Answer 1

$M_{H2O}$=18 g/mol
Deci m de substanta in 3 moli=18x3=54

Answer 2

M-masa moleculara
M H2O=2*1+16

M H2O=2+16

M H2O=18g/mol

m=3*18

m=54 g