Calculate the mass percent of different elements present in sodium sulphate $\left({\mathrm{Na}}_2{\mathrm{SO}}_4\right)$.

Calculate the amount of carbon dioxide that could be produced when,

$1$ mole of carbon is burnt in $16 \mathrm{g}$ of dioxygen.

$$\begin{gathered} \mathrm{A} : 0.01 \mathrm{moles} \\ \mathrm{B} : 0.5 \mathrm{moles} \\ \mathrm{C} : 0.1 \mathrm{moles} \end{gathered}$$

Enter your correct answer as $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$.

$\mathrm{A}:$$14.55$

$\mathrm{B}:$$12.44$

$\mathrm{C}:$$15.44$

Enter your correct answer as $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$.

How much copper can be obtained (in 'g') from $100 \mathrm{g}$ of copper sulphate $\left({\mathrm{CuSO}}_4\right)$?
$\left[\mathrm{Atomic} \mathrm{weight} \mathrm{of} \mathrm{Cu}=63.5\right]$

$$\begin{gathered} \mathrm{A} : 36.8 \\ \mathrm{B} : 39.81 \\ \mathrm{C} : 49.81 \end{gathered}$$

Enter your correct answer as $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$.