Question

doua grame de calciu reactioneaza cu apa. determinati a) cati moli de apa se consuma b) cate grame de hidroxid de calciu se obtin URGENTTT​

Answer 1

Răspuns:

MCa =40g/mol

n=2/40=0,05 moli Ca

a)

1mol............2moli

Ca + 2H2O => Ca (OH)2 + H 2

0,05 moli....ymoli

y=0,05×2/1=0,1 moli H2O

b)

MCa(OH)2=40+2×16+1×1=74g/mol

40g..................................74g

Ca + 2H2O => Ca (OH)2 + H 2

2g...............................xg

x= 2×74/40=3,7 g Ca(OH)2