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Ca + H2SO4 = CaSO4 + H2
40g - 98g
5g - x
x = 12,25g - tyle kwasu potrzeba
100g - 7g
x - 12,25g
x = 175g
<ro> = m/V
V = m/<ro>
V = 175g/ 1,25g/cm3 = 140cm3
Odp. Potrzeba 140cm3 kwasu