Calculate the number of gram of ${\mathrm{SO}}_2$ which can be prepared by the treatment of $100 \mathrm{g}$of ${\mathrm{Na}}_2{\mathrm{SO}}_3$ with $\mathrm{HCl}$.

$0.5$mole each of ${\mathrm{H}}_2\mathrm{S}$ and ${\mathrm{SO}}_2$ mixed together in a reaction flask, react according to equation:

$2{\mathrm{H}}_2\mathrm{S}+{\mathrm{SO}}_2⟶2{\mathrm{H}}_2\mathrm{O}+3\mathrm{S}$

Calculate the number of moles of $\mathrm{S}$ formed.

Calculate the volume of $1.00 \mathrm{mol} {\mathrm{L}}^{-1}$ aqueous solution of sodium hydroxide that is neutralised by$200 \mathrm{mL}$ of $2.00 \mathrm{mol} {\mathrm{L}}^{-1}$ aqueous hydrochloric acid and the mass of sodium chloride obtained.

Neutralisation reaction is

$\mathrm{NaOH}\left(\mathrm{aq}\right)+\mathrm{HCl}\left(\mathrm{aq}\right)⟶\mathrm{NaCl}\left(\mathrm{aq}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

Lithium oxide is used to remove water from air according to the reaction,

${\mathrm{Li}}_2\mathrm{O}\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)⟶2\mathrm{LiOH}\left(\mathrm{s}\right)$

If $72 \mathrm{kg}$ of water is to be removed and $35 \mathrm{kg}$ of ${\mathrm{Li}}_2\mathrm{O}$ is available, then

Which reactant is limiting?

Lithium oxide is used to remove water from air according to the reaction,

${\mathrm{Li}}_2\mathrm{O}\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)⟶2\mathrm{LiOH}\left(\mathrm{s}\right)$

If $72 \mathrm{kg}$ of water is to be removed and $35 \mathrm{kg}$ of ${\mathrm{Li}}_2\mathrm{O}$ is available, then how many $\mathrm{kg}$ of excess reactant is left?

Weighing $3104$ carats $(1 \mathrm{carat}=200 \mathrm{mg})$ , the Cullinan diamond was the largest natural diamond ever found. How many carbon atoms were present in the stone?