(1)H2SO4 + 2NaOH == Na2SO4 + 2H2O
98 80
100*4.9% x
解得x=4kg
(2)H2SO4 + Ca(OH)2 == CaSO4 + 2H2O
98 74
100*4.9% x
解得x=3.7kg
节约:4*24-3.7*6=73.8元
(1)H2SO4 + 2NaOH == Na2SO4 + 2H2O
98 80
100*4.9% x
解得x=4kg
(2)H2SO4 + Ca(OH)2 == CaSO4 + 2H2O
98 74
100*4.9% x
解得x=3.7kg
节约:4*24-3.7*6=73.8元