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WorksheetsMole Concepts (NA PP)
Total questions: 20
Worksheet time: 30mins
Relative atomic mass, Ar, is defined by comparing the mass of one atom with the mass of another atom, Z.
What is Z?
12C
1H
24Mg
16O
A compound has a molecular formula of X2O and a relative molecular mass of 44.
What is the relative atomic mass of X?
9
14
18
28
What is the amount, in moles, of CuO present in 20g of pure CuO?
[relative atomic masses, Ar: Cu, 64; O, 16]
0.25
0.4
4
20
A hydrocarbon molecule CxHy has a relative molecular mass of 42. What are the values of x and y?
x =1, y = 2
x=3, y =6
x=6, y=3
x=6, y=6
The diagram a model of a molecule.
What is the relative molecular mass, Mr, of this molecule?
66
82
98
146
A compound has the formula CH3CO2H.
How should the relative molecular mass, Mr, of this compound be calculated?
12 + 1 + 16
3(12 + 1) + 2(12 + 16) + 1
(2 x 12) + (4 x 1) + (2 x 16)
(4 x 12) + (2 x 1) + 16
Carbon, 126C, and sulfur, 3216S, form the compound carbon disulfide, CS2.
What is the relative molecular mass, Mr, of carbon disulfide?
6 + 16
6 + (2 x 16)
12 + 32
12 + (2 x 32)
The model shown represents a molecule of ethanol.
What is the relative molecular mass, Mr, of ethanol?
9
26
40
46
How many moles are in 225g of CO?
8.04 mole
28.01 mole
4.82x1024 mole
7.50 mole
How many moles are in 1.0g of NaCl ?
0.181 mole
6.0 x 1023 mole
0.50 mole
0.0171 mole
What is the mass of 0.75 moles of (NH4)3PO4?
0.0044 g
91 g
110 g
74 g
Which of the following shows the correct steps for calculating the relative formula mass of CuSO4.5H2O?
64 + 32 + 16 + 1 + 16
64 + (1 × 32) + (4 × 16) + 5(2 + 16)
64 + (4 × 32) + (4 × 16) × 5(2 + 16)
4(64 + 32 + 16) + 5(2 + 16)
Which of the following gases has the greatest mass at room temperature and pressure?
0.5 dm3 of argon (Ar)
200 cm3 of ammonia (NH3)
5 dm3 of hydrogen (H2)
1000 cm3 of water vapour (H2O)
0.8 g of sodium hydroxide is dissolved to form a 250 cm3 aqueous solution. What is the concentration of this solution?
0.02 mol/dm3
0.08 mol/dm3
0.04 mol/dm3
0.80 mol/dm3
Which of the following solutions of hydrochloric acid has the highest concentration?
0.10 mol of HCl in 0.10 dm3 of solution
0.10 mol of HCl in 1.00 dm3 of solution
36.5 g of HCl in 0.10 dm3 of solution
36.5 g of HCl in 1.00 dm3 of solution
A sample of methane (CH4) has a volume of 12 dm3 at room temperature and pressure. Calculate the number of moles of CH4 in the sample. (include units in your answer)
(a)
A sample of methane (CH4) has a volume of 42 dm3 at room temperature and pressure. Find the mass of this sample in grams. (include units in your answer)
(a)
