Question

Ca + 2HCl --> CaCl2 + H2 ( The atomic mass of Ca=40 , H=1, Cl=35.5 ) the mass of reactants and products is ________. *

Answer 1

1st

the mass of reactant is

40 + 2*(1+35.5)

40 + 2*36.5

40 + 73

113 is the mass of reactant

2nd

the mass of product is

40 + (35.5 )*2 + 2

40 + 71 +2

113 is the mass of product

mass of reactant is equals to mass of product.

hope it helps :)