Calculati masa varului stins care se obtine din 3,5 kg de var nestins care contine 5% impuritati

Calculati  masa varului stins care se obtine din 3,5 kg de var nestins care contine 5% impuritati

Ecuatia reactiei chimice este:

CaCO3  =  CaO  +  CO2

CaO+H2O=Ca(OH)2

Daca in 100 kg var stins avem………..5kg impuritati……………95kg CaO pur

Atunci in 3.5kg avem…………………..x kg impuritati si …………y kg CaO pur

.y=3.5*95/100=3.325kg

3.325kg……………………..a kg

CaO……………+H2O…..=Ca(OH)2

56kg………………………..74kg

.a=3.325*74/56=4.39kg Ca(OH)2

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