1. Find the amount of substance by the formula n = m / M.
a). М (К2СО3) = 39 × 2 + 12 + 16 × 3 = 138 g / mol, n (K2CO3) = 13.8 / 138 = 0.1 mol.
b). M (CaCl2) = 40 + 35.5 × 2 = 111 g / mol, n (CaCl2) = 11.1 / 111 = 0.1 mol.
Substances react in proportion to the coefficients, they are formed too.
K2CO3 + CaCl2 = CaCO3 + 2KCl
CaCO3 is also formed in an amount of 0.1 mol.
Find the mass: m = n × M. M (CaCO3) = 100 g / mol;
m (CaCO3) = 0.1 × 100 = 10 g.
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