Calculate the mass of sodium acetate $\left({\mathrm{CH}}_3\mathrm{COONa}\right)$ required to make $500 \mathrm{mL}$ of $0.375$ molar aqueous solution. Molar mass of sodium acetate is $82.0245 {\mathrm{gmol}}^{-1}$.($15.38 \mathrm{g}$/$14.38 \mathrm{g}$)

$\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 $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$.
 

$$\begin{gathered} \mathrm{A} : 36.4527 \mathrm{u} \\ \mathrm{B} : 35.4527 \mathrm{u} \\ \mathrm{C} : 34.4527 \mathrm{u} \end{gathered}$$

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

Number of moles of carbon atoms.
(Only mention the number, not the unit)

In three moles of ethane $\left({\mathrm{C}}_2{\mathrm{H}}_6\right)$, calculate the following:

The number of moles of hydrogen atoms. 

In three moles of ethane $\left({\mathrm{C}}_2{\mathrm{H}}_6\right)$, calculate the following:

The number of molecules of ethane.