Question

Calculati cantitatea de calciu respectiv oxid de calciu care formeaza prin reactie cu apa 370g hidroxid de calciu !

Answer 1

56g.......................74g
CaO + H2O = Ca(OH)2
x=280g..................370g

n=m/M=280/56=5 moli CaO

40g.....................74g
Ca + 2H2O = Ca(OH)2 + H2
x=200g..................370g

n=m/M=200/40=5 moli Ca

Answer 2

Ca + 2 H2O = Ca(OH)2 + H2
40 g Ca..................74 g Ca(OH)2
a g Ca.................370 g Ca(OH)2
a = 200 g Ca

CaO + H2O => Ca(OH)2
56 g CaO........74 g Ca(OH)2
b g CaO..................Ca(OH)2
b = 280 g CaO

n=m/M=280/56=5 moli CaO