Answer the following:

CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance

Problem

Answer the following: (a) How many atoms of the different elements are there in the formulae of the compounds given below? (i) Nitric acid,

\mathrm{HNO_3}

(ii) Methane,

\mathrm{CH_4}

(iii) Copper nitrate,

\mathrm{Cu(NO_3)_2}

(iv) Ethanoic acid,

\mathrm{CH_3COOH}

(v) Sugar,

\mathrm{C_{12}H_{22}O_{11}}

(vi) Phenol,

\mathrm{C_6H_5OH}

(vii) Ammonium sulfate,

\mathrm{(NH_4)_2SO_4}

(b) Balance the following equations: (i)

\mathrm{Zn(s)+O_2(g)\rightarrow ZnO(s)}

(ii)

\mathrm{Fe(s)+Cl_2(g)\rightarrow FeCl_3(s)}

(iii)

\mathrm{Li(s)+O_2(g)\rightarrow Li_2O(s)}

(iv)

\mathrm{H_2(g)+O_2(g)\rightarrow H_2O(g)}

(v)

\mathrm{Mg(s)+CO_2(g)\rightarrow MgO(s)+C(s)}