Question

La chimie va rogggggggggggggggg!!!! Ugent

Answer 1

Răspuns:

Explicație:

M Ca = 40 g/mol

M H2O = 18 g/mol

M Ca(OH)2 = 40 + 17*2 = 40 + 34 = 74 g/mol

M H2 = 2 g/mol

Ca + 2H2O = Ca(OH)2 + H2

x Ca(OH)2 = 40*74/40 = 74 g

x H2 = 40*2/40 = 2 g