Question

Dau coroana !!!!!
1.Ce volum de oxigen se găsește in 640g?
2.Calculati raportul molilor elementelor dintr-un amestec format din:21,6 argint si 8,1 aluminiu?

Answer 1

$1)M_{O_2}=2A_{O}=32g/mol$

$n=\frac{m}{M}=20$

$1mol \ O_2..........22,4l$

$20moli \ O_2..........x \ l$

$x=20*22,4=448l$

$2)M_{Ag}=108g/mol$

$M_{Al}=27g/mol$

$n_{Ag}=\frac{m_{Ag}}{M_{Ag}}=0,2$

$n_{Al}=\frac{m_{Al}}{M_{Al}}=0,3$

$\frac{0,3}{0,2}=1,5$