a) \(n_{C_6H_{12}O_6}=\dfrac{7,2}{6}=1,2\left(mol\right)\)
\(\left\{{}\begin{matrix}m_H=1,2.12=14,4\left(g\right)\\m_O=1,2.6.16=115,2\left(g\right)\end{matrix}\right.\)
b) \(n_{C_{12}H_{22}O_{11}}=\dfrac{26,4}{22}=1,2\left(mol\right)\)
\(\left\{{}\begin{matrix}m_C=1,2.6.12=172,8\left(g\right)\\m_O=1,2.11.16=211,2\left(g\right)\end{matrix}\right.\)