mk sửa lại đề chút nha:
sau pu thu dc 15,4l khi X (dktc), co ti khoi so vs metan là 2,875
giải:
\(M_X=2,875.16=46\) => X la NO2
\(n_{NO_2}=\dfrac{15,4}{22,4}=0,6875\left(mol\right)\)
2Mg(NO3)2 \(\underrightarrow{t^o}\) 2MgO + 4NO2 + O2 \(n_{Mg\left(NO_3\right)_2}=n_{MgO}=0,34375\left(mol\right)\)
a, \(m_{Mg\left(NO_3\right)_2}=0,34375.148=50,875g\)
b, \(m_{MgO}=0,34375.40=13,75g\)
\(m_{NO_2}=0,6875.46=31,625g\)
\(m_{O_2}\approx0,172.32\approx5,504g\)