Question

Giúp bài 3

Answer 1

a)

PTHH: \(2Mg+O_2\xrightarrow[]{t^o}2MgO\)

b)

Đặt \(m_{O_2}=a\left(g\right)\)

=> \(m_{Mg}=1,5a\left(g\right)\)

Áp dụng ĐLBTKL:

\(a+1,5a=8\\ \Leftrightarrow a=3,2\left(g\right)\\ \Rightarrow\left\{{}\begin{matrix}m_{O_2}=3,2\left(g\right)\\m_{Mg}=1,5.3,2=4,8\left(g\right)\end{matrix}\right.\)