Tag Archives: Stoichiometry
A 6.50 molal solution of KOH (aq) has density of $1.89 g.cm^{-3} $ ….
A 6.50 molal solution of KOH (aq) has density of $1.89 g.cm^{-3} $. The molarity of solution is _ _ _ _ $mol.dm^{-3} $. (Round off to the nearest integer).
[Atomic masses: K = 39.0 u, O = 16.0 u, H = 1.0 u] Continue reading A 6.50 molal solution of KOH (aq) has density of $1.89 g.cm^{-3} $ ….
Complete combustion of 750 g of an organic compound ….
Complete combustion of 750 g of an organic compound provides 420 g of $CO_2 $ and 210 g of $H_2 O $. The percentage composition of carbon and hydrogen in organic compound is 15.3 and _ _ _ _ respectively. (Round off to the nearest integer) Continue reading Complete combustion of 750 g of an organic compound ….
80 g of copper sulphate $CuSO_4 .5H_2 O $ ….
80 g of copper sulphate $CuSO_4 .5H_2 O $ is dissolved in deionised water to make 5 L of solution. The concentration of the copper sulphate solution is $x \times 10^{-3} mol L^{-1} $. The value of x is _ _ _ _ . (Nearest integer)
[Atomic masses – Cu:63.54 u, S:32 u, O: 16 u, H: 1 u]
Solution
$Molarity = \frac {n}{V} = \frac {w}{M_0 L} $
$\therefore Molarity = \frac {80}{249.54 \times 5 } \approx 64 \times 10^{-3} mol L^{-1} $
$\therefore x = 64 $