CCEA
MODULE 1
TEST
Calculations and Equations
1. What mass of
material is there in each of the following?
(a) 2.00 mol of
SO3 molecules
(b) 0.0300 mol of Cl atoms
(c) 9.00 mo1
of SO42- ions
(d) 0.150 mol
of MgSO4.7H2O molecules [4]
2. What amount
of each substance is contained in the following?
(a) 31.0 g of P4
molecules
(b) 1.00 x 1022 atoms of Cu
(c) 70.0 g of
Fe2+ ions
(d) 9.00 x
1024 molecules of C2H5OH [4]
3.
The mass of one molecule of a compound is 2.19 x 10-22
g.
What is the
molar mass of the compound? [2]
4. What mass of
aluminium, Al, is required to produce 1000 g of iron, Fe, according to the
equation:
3Fe3O4(s) + 8Al(s) 4A12O3(s) +
9Fe(s) [3]
5. A solution is
made containing 2.38 g of magnesium chloride, MgC12, in 500 cm3
of solution.
(a) What is the
concentration of magnesium chloride, MgC12, in this solution?
(b) What is the concentration of chloride ions in this
solution? [3]
6. A solution is
made by dissolving 8.50 g of sodium nitrate, NaNO3, and
16.40 g of calcium nitrate, Ca(NO3)2,
in enough water to give 2000 cm3 of solution.
(a) What is the
concentration of sodium ions in the solution?
(b) What is the
concentration of nitrate ions in the solution? [4]
7. A hydrated
aluminium sulphate A12(SO4)3.xH2O, contains 8.10% of
aluminium by mass.
Find the value of x [5]
[TOTAL: 25 marks]