4, a, C + O2 \(\underrightarrow{t^0}\) CO2
b, theo ĐLBTKL: \(m_C+m_{O_2}+m_{tc}=m_{CO_2}\)
\(\Rightarrow m_{tc}=\left(m_C+m_{O_2}\right)-m_{CO_2}\)
\(\Rightarrow m_{tc}=4,7-4,4=0,3kg\)
\(\%m_C=\dfrac{1,5}{1,5+0,3}.100\%\approx83,33\%\)
\(m_{C\left(trongthan\right)}\approx\dfrac{83,33.3}{100}\approx2,5kg\)
đổi 2,5 kg = 2500g
\(n_C=\dfrac{2500}{12}\approx208,33\left(mol\right)\)
theo pt ta có: \(n_C=n_{O_2}=n_{CO_2}=208,33\left(mol\right)\)
\(m_{O_2}=208,33.32\approx6666,56g\approx6,7kg\)
\(m_{CO_2}=208,33.44\approx9166,52g\approx9,2kg\)