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Worksheetsmole concept
Total questions: 14
Worksheet time: 13mins
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 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
What is the mass of one mole of aluminum?
26.981 g/mol
13 g/mol
53.985 g/mol
14 g/mol
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
Which of the following about 12 dm3 of nitrogen and 12 dm3 of carbon monoxide is correct?
1 Both contain 3 x 1023 molecules.
2 Each contain 0.5 mole of gas.
3 Both have the same mass.
1 only
1 and 2
2 and 3
All of the above
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
What is the molar mass of one molecule of Nitrogen N2?
14 amu (atomic mass units)
14 g
28 g
28 amu
What is the molar mass of one mole of N2 molecules ?
6.02 x 1023 molecules
14.007 g
28.014 g
28.014 amu
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)
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)
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
How many moles are 98.3 grams of aluminum hydroxide, Al(OH)3? (Atomic mass of Al = 27, H= 1, O = 16)
1.26 mol
0.8 mol
7,673.4 mol
150 mol
Which substance has the same number of moles as 64 g of copper?
10 g of helium gas
48 dm3 of nitrogen gas
56 g of iron
80 g of bromine gas
