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Worksheetsrelative Atomic and relative Molecular Mass
Total questions: 15
Worksheet time: 8mins
Calculate the relative atomic mass of an element if it consists of 90% of isotope A (atomic mass 10) and 10% of isotope B (atomic mass 12).
10.5
11.0
9.8
10.2
Determine the relative molecular mass of H2O.
20
18
22
16
What is the average atomic mass of an element if it consists of 75% of isotope X (atomic mass 20) and 25% of isotope Y (atomic mass 22)?
21
20
19
23
Calculate the molar mass of CO2.
36.01 g/mol
50.02 g/mol
28.02 g/mol
44.01 g/mol
If an element has three isotopes with atomic masses 10, 11, and 12, and their abundances are 20%, 30%, and 50% respectively, what is the average atomic mass?
11.3
12.2
10.5
11.8
Find the relative molecular mass of CH4.
22.990
18.015
12.011
16.043
What is the molar mass of NaCl?
58.44 g/mol
55.84 g/mol
60.44 g/mol
63.44 g/mol
If an element has two isotopes with atomic masses 16 and 18, and their abundances are 75% and 25% respectively, what is the average atomic mass?
16.5
15.5
17.5
16.75
Calculate the relative atomic mass of an element with isotopes of atomic masses 14 and 16, and their abundances are 60% and 40% respectively.
14.8
14.3
15.2
13.5
Determine the molar mass of H2SO4.
72.63 g/mol
36.46 g/mol
98.09 g/mol
58.44 g/mol
What is the average atomic mass of an element if it consists of 80% of isotope P (atomic mass 30) and 20% of isotope Q (atomic mass 32)?
33.5
29.8
31.2
30.4
Calculate the relative molecular mass of C6H12O6.
150.24
90.08
200.32
180.16
Find the molar mass of NH3.
14.03 g/mol
17.04 g/mol
15.99 g/mol
18.02 g/mol
If an element has three isotopes with atomic masses 50, 52, and 54, and their abundances are 25%, 50%, and 25% respectively, what is the average atomic mass?
49
54
52
50
Calculate the relative atomic mass of an element with isotopes of atomic masses 18 and 20, and their abundances are 70% and 30% respectively.
18.6
16.2
19.8
21.4
