Question

1) Ce cantitate de NaCl contine 11,5g Na?
2) Ce cantitate de CaCo3 contine 200g Ca? 3) Ce cantitate de CaO contine 0,200g Ca?

Va rog este urgent!!!!
Dau Coroana!!!!!​

Answer 1

1)

23g Na.......58,5g NaCl

11,5g Na..........x

x = 11,5*58,5/23 = 29,25g NaCl

2)

40g Ca........ 100g CaCO3

200g Ca...........x

x = 200*100/40 = 500g CaCO3

3)

40g Ca..........56g CaO

0,2g Ca............x

x = 0,2*56/40 = 0,28g CaO