Answer
a) $C_4H_6O_6$
b) $C_3H_8$
c) $B_4H_{10}$, $53.32\ g/mol$
Work Step by Step
a) Empirical formula's molar mass: $M_u=75.04\ g/mol$
$M/M_u=2.0$, empirical formula: $C_2H_3O_3$
Molecular formula: $C_4H_6O_6$
b) Empirical formula's molar mass: $M_u=44.10\ g/mol$
$M/M_u=1.0$, empirical formula: $C_3H_8$
Molecular formula: $C_3H_8$
c) From the molecular formula: empirical formula $B_4H_{10}$ (1 unit)
Molar mass: $53.32\ g/mol$
