Question

Ce cantitate de oxigen se gaseste in:
a) 36 g H2O
b) 2 moli H2SO4
c) 0,5 kmoli SO2

Dau 20 puncte va rog ​

Answer 1

a.36 g H2O

MH2O=2+ 16=18-------->18g/moli

18g H2O--------16 g O

36g H2O---------Xg

x=36 . 16 : 18=32 g O

b.

2moli H2SO4

-se afla masa de H2SO4  (m)

M=2+32 + 4.16= 98------> 98 g/moli

n=m:M     [ n=nr.moli]

m=2moli . 98g/moli=196 g H2SO4

98g H2SO4----------64 g O

196 g---------------------x

x=196 .64 :98=128 g O

c.

0,5 kmoli=500 moli SO2

MSO2=32 + 2.16 =64------> 64g/moli

n=m:M

m=n.M

m=500moli . 64g/moli=32000 g SO2

64 g SO2----------32 g O

32000g--------------x

x=32000 . 32 :64=16000 g O=16 kg O