What is the weight of carbon in $kg$ required to produce $270 \ kg$ of aluminum from bauxite by the Hall-Heroult process?

Six volumes of oxygen,on complete ozonisation,form ...... volumes of ozone.

For the following reaction,the mass of water produced from $445 \ g$ of $C_{57}H_{110}O_6$ is .............. $g$.
$2C_{57}H_{110}O_{6(s)} + 163O_{2(g)} \to 114CO_{2(g)} + 110H_2O_{(l)}$

$30.0 \ mL$ of the given $HCl$ solution requires $20.0 \ mL$ of $0.1 \ M$ sodium carbonate solution for complete neutralisation. What is the volume of this $HCl$ solution required to neutralise $30.0 \ mL$ of $0.2 \ M$ $NaOH$ solution (in $mL$)?

The active mass of benzene $(C_6H_6 = 78)$ with a density of $1.56 \, g/mL$ is .......

The volume of $0.05 \, M$ $H_2SO_4$ required to neutralize $80 \, mL$ of $0.13 \, N$ $NaOH$ will be ...... $mL$.