Calculate the mass (in grams) in $3 \mathrm{mol}$ of ammonia, ${\mathrm{NH}}_3$. (Give the value rounded-off to the nearest integer)

Calculate the mass (in grams) in $0.710 \mathrm{mol}$ of calcium phosphate, ${\mathrm{Ca}}_3{\left({\mathrm{PO}}_4\right)}_2$. (Give the value rounded-off to the nearest integer)

Calculate the mass (in grams) in $0.211 \mathrm{mol}$ of iron(III) oxide, ${\mathrm{Fe}}_2{\mathrm{O}}_3$. (Give the value rounded-off to the nearest integer)

Calculate the number of particles present in $9.80 \mathrm{g}$ of phosphoric acid, ${\mathrm{H}}_3{\mathrm{PO}}_4$.

Calculate the number of particles present in $60.77 \mathrm{g}$ of iron(II) sulfate, ${\mathrm{FeSO}}_4$.

Calculate the number of particles present in $12.10 \mathrm{g}$ of ethanoic acid, ${\mathrm{C}}_2{\mathrm{H}}_4{\mathrm{O}}_2$.

Calculate the number of particles present in $6.40 \mathrm{g}$ of sulfur dioxide, ${\mathrm{SO}}_2$.

Calculate the volume of each of the following samples of gases at STP $7.6 \mathrm{g}$ of argon, $\mathrm{Ar}$ (Give the value rounded-off to one decimal place)

Calculate the volume (in ${\mathrm{dm}}^3$) of the following sample of gas at STP, $100 \mathrm{g}$ of ethene, ${\mathrm{C}}_2{\mathrm{H}}_4$. (Give the value rounded-off to one decimal place)