Metallic gallium does not occur in nature in an uncombined state. Instead, it is found in gallium($\mathrm{III}$) compounds within bauxite and zinc ores. With a melting point close to room temperature, the melting point of this metal can be exceeded by the warmth of the palm of your hand. Which other metal is a liquid at room temperature?

Calculate the amount (in moles) for the following mass:

$4.00 \mathrm{g}$ of sodium hydroxide $\mathrm{NaOH} ({\mathrm{M}}_{\mathrm{r}}=40.00 \mathrm{g} {\mathrm{mol}}^{-1})$.

Calculate the amount (in moles) for the following mass:

$58.80 \mathrm{g}$ of sulphuric acid ${\mathrm{H}}_2{\mathrm{SO}}_4$.

Calculate the amount (in moles) for the following mass:

$14.6 \mathrm{g}$ of hydrogen chloride $\mathrm{HCl}$ (calculate ${\mathrm{M}}_{\mathrm{r}}$).

Calculate the amount (in moles) for the following mass:

$58.8 \mathrm{g}$ of nitric acid ${\mathrm{HNO}}_3$ (calculate ${\mathrm{M}}_{\mathrm{r}}$).

Calculate the concentration, in $\mathrm{mol} {\mathrm{dm}}^{-3}$, of the following:

$0.20 \mathrm{mol}$ of nitric acid, ${\mathrm{HNO}}_3$, dissolved in water to make a $0.50 {\mathrm{dm}}^3$ solution.

Calculate the concentration, in $\mathrm{mol} {\mathrm{dm}}^{-3}$, of the following:

$8.00 \mathrm{g}$ of sodium hydroxide, $\mathrm{NaOH}$, dissolved in water to make a $0.80 {\mathrm{dm}}^3$ solution.

Calculate the concentration, in $\mathrm{mol} {\mathrm{dm}}^{-3}$, of the following:

$0.45 \mathrm{mol}$ of sulphuric acid, ${\mathrm{H}}_2{\mathrm{SO}}_4$, dissolved in water to make a $0.75 {\mathrm{dm}}^3$ solution.

Calculate the concentration, in $\mathrm{mol} {\mathrm{dm}}^{-3}$, of the following:

$6.80 \mathrm{g}$ of ammonia, ${\mathrm{NH}}_3$, dissolved in water to make a $800 {\mathrm{cm}}^3$ solution.