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Calculate the molarity of each of the following solution: (a) $30 \mathrm{~g}$ of $\mathrm{Co}\left(\mathrm{NO}_{3}\right)_{2}, 6 \mathrm{H}_{2} \mathrm{O}$ in $4.3 \mathrm{~L}$ of
Calculate the molarity of each of the following solution: (a) $30 \mathrm{~g}$ of $\mathrm{Co}\left(\mathrm{NO}_{3}\right)_{2}, 6 \mathrm{H}_{2} \mathrm{O}$ in $4.3 \mathrm{~L}$ of
Chemistry | Previous Year Question Papers
Calculate the molarity of each of the following solution: (a) $30 \mathrm{~g}$ of $\mathrm{Co}\left(\mathrm{NO}_{3}\right)_{2}, 6 \mathrm{H}_{2} \mathrm{O}$ in $4.3 \mathrm{~L}$ of

solution (b) $30 \mathrm{~mL}$ of $0.5 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4}$ diluted to $500 \mathrm{~mL}$.
Solution 3:
(a) Molar mass of $\mathrm{Co}\left(\mathrm{NO}_{3}\right)_{2}, 6 \mathrm{H}_{2} \mathrm{O}=310.7 \mathrm{~g}$ mol-1
no. of moles $=30 / 310.7=0.0966$
Vol. of solution $=4.3 \mathrm{~L}$
Molarity $=0.0966 / 4.3=0.022 \mathrm{M}$
(b) $1000 \mathrm{~mL}$ of $0.5 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4}$ contain $\mathrm{H}_{2} \mathrm{SO}_{4}=0.5$ mole $30 \mathrm{~mL}$ of $0.5 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4}$ contain $\mathrm{H}_{2} \mathrm{SO}_{4}$ $=0.5 / 1000 \times 30=0.015$ mole
Volume of solution $=500 \mathrm{~mL}=0.5 \mathrm{~L}$
Molarity $=0.015 / 0.5=0.03 \mathrm{M}$

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