Răspuns:
Explicație:
a.
48,176 .10 la 26 = 48176 .10 ²³ molecule H2O
n= 48176.10²³ : 6,023.10²³ = 79,98 moli ----> aprox. 80 moli H2O
b.
M FeS= 56 + 2.32= 120-------> 120g/moli
120g FeS----------64g S
2400g FeS------------xgS
x= 2400 .64 : 120= 1280 g S
MH2S= 2 + 32=34-------> 34g/moli
34g H2S---------32g S
yg H2S--------------1280g S
y= 34 . 1280 : 32= 1360 g H2S
c.
81,6 g X-------------2,4 moli X
x g---------------------------1mol X
x= 81,6 g : 2,4 g/moli = 34g -------> X= H2S
M= 2 + 32 = 34------> 34g/moli