Объяснение:
1)2NaOH + H2SO4 = Na2SO4 + 2H2O
Fe(OH)2 + H2SO4 = FeSO4 + 2H2O
Ca + 2HCl = CaCl2 + H2
Fe2O3 + 3H2SO4 = Fe2(SO4)3 + 3H2O
3Ba(OH)2 + 2H3PO4 = Ba3(PO4)2 + 6H2O
80 г Х г
2) 2NaOH + H2SO4 = Na2SO4 + 2H2O
n=2 моль n=1 моль
М=40 г/моль М = 142 г/моль
m= 80 г m=142 г
80 г NaOH - Х г Na2SO4
80 г NaOH - 142 г Na2SO4
m(Na2SO4) = 80 * 142 / 80 = 142 г
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Объяснение:
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