WorksheetsNumber of particles
Total questions: 8
Worksheet time: 6mins
The chemical formula for tetrachloromethane is CCl4. What is the relative molecular mass of tetrachloromethane?[Relative atomic mass: C, 12; Cl, 35.5]
154.0
118.5
83.0
47.5
How many times are 2 copper atoms heavier than an oxygen atom?
[Relative atomic mass: O=16, Cu=64]
4
8
16
64
The mass of three atoms of element X is equal to the mass of four carbon atoms. X is not the actual symbol of the element. What is the relative atomic mass of element X? [Relative atomic mass of C=12]
48
36
16
12
The mass of two atoms of element X is equal to that of three atoms of sulphur. What is the relative atomic mass of element X? [Relative atomic mass: S=32]
96
48
32
24
The relative atomic mass of an element X is defined as
___Mass of one atom of X
1/12 x mass of one carbon-12 atom
12 x mass of one atom of X
Mass of one carbon-12 atom
____Mass of one atom of X
12 x mass of one carbon-12 atom
__Mass of one mole of atom X
1/12 x mass of one carbon-12 atom
What is the number of atoms in 0.5 mol of ammonia gas, NH3? [Avogadro constant = 6-02 x 1023 mol-1]
B
C
D
6.02 x 1023
0.5 x 6 02 x 1023
0.5 x 2 x 6-02 x 1023
0.5 x 4 x 6-02 x 1023
How many molecules of bromine are there in 0.045 mol of bromine?
[Avogadro Constant ; 6.02 X 1023 mol-]
2.7 X 1022
3 X 1023
7.9 X 1024
1.2 X 1025
What is the number of oxygen atom in 0.1 mole of water?
[Avogadro constant, 6.02 x 1023 mol-1]
6.02 x 1022
6.02 x 1023
60.2 x 102
3.01 x 1023
