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Cate grame de calciu se gasesc in 250g carbonat de calciu?

Răspuns :

MCaCO3=ACa+AC+3AO=40+12+3×16=100
100gCaCO3...40gCa...12gC...48gO
250gCaCO3....x..............u..........z
x=250×40/100=100cAd