Tasks and exercises
1.
What is the volume of hydrogen gas produced by the reaction of 2.4 g
of Mg with enough HCl? (Mg:24)
2.
How many grams of NaOH is required to neutralize completely 19.6 g of
H2SO4? (S:
32,
H:
1.
O:
16,
Na:
23)
3.
What mass of phosphoric acid can be obtained from the reaction of
14.2 g of P2O5 with excess water?
4.
Calculate the no. of moles of 5.68 gm. of iron.
5.
How much copper can be obtained from 110gm of
CuSO4?
6.
A compound contains 4.07% hydrogen, 24.27% carbon and 71.65% of
chlorine. Its molar mass is 98.96g. What are its empirical and molecular
formulas?
7.
Calculate the no. of atoms present in 11.5 litres of H2 at
N.T.P.
8.
Calculate the molecular mass of Ca(OH)2, HCl,
CuSO4, Al2O3.
9.
When burning 15 g of coal remained 0.35 grams of ash. Calculate the
amount of carbon dioxide released and the mass fraction of carbon in this coal
sample.
10.
Determine the formula of crystalline hydrate, consisting of 12.85%
sodium, 8.65% phosphorus, 6.98% hydrogen, 71.52%
oxygen.