Basic Concepts of Chemistry Assignment

Basic Concepts of Chemistry Assignment
1. A hydrated salt, MCl2 2H2
O, has 24.9% by weight of water of hydration. Calculate the % by weight of chlorine in it.
At weight of chlorine = 35.46.
2. A certain oxide of iron has 72.4% by weight of iron in it (at. weight = 56). If it is regarded as a mixed oxide of FeO and
Fe2
O3
, what is the mole ratio of these two compounds in it?
3. One volume of a certain gaseous oxide of carbon requires exactly two volumes of oxygen for oxidation. The product
which is a gas is completely absorbed by KOH. Suggest a formula for the oxide.
4. Excess of potassium iodide (in presence of dilute HCl) is added to 0.01 mole of pure Barium chromate suspended in
water. Calculate the weight of Iodine (in g) liberated. Write the relevant equations (At. wt of Iodine = 127).
5. In an experiment on the conversion of Oxygen to ozone in an ozonizer, it was observed that 50 ml of O2
gas yielded 46
Basic Concepts of Chemistry Assignment
ml of ozonized oxygen. If 20 ml of the ozonised oxygen are exposed to an oil like turpentine which can absorb ozone.
Find out what may be the residual volume of oxygen. All volume measurements are made at the same temperature
and pressure.
6. 1.58 g of a mixture of Na, and K,, were dissolved in water and treated with excess of AgNO3
aq. The total weight
of the precipitate (Ag,) was 2.35 g. Calculate the weight % of Na, in the original mixture. Atomic weights: Na = 23,
K = 39, , = 127, Ag = 108.
7. A mixture of NaNO3
and NaCl is heated till all the NaNO3
in it is converted into NaNO2
. If there is a loss of 0.114 g
per gram of the original mixture. Determine the weight % of NaCl in it.
8. A mixture of NaBr and NaBrO3
in the mole ratio 2 : 3 is treated with excess of dilute acid. State (i) the componding
(reactant) which is limiting and (ii) the number of moles of Bromine liberated. [Consider that actually 2 moles of
are present]
.