■ Definition : : Molar volume : The volume occupied by 1 mole of gas at a particular temperature and pressure.
► | At room conditions (25°C and pressure 1 atmosphere), 1 mole of gas occupies a volume of 24dm3 . | |
► | At standard condition (0 and pressure 1 atmosphere), 1 mole of gas occupies a volume 22.4dm3. |
✍ Worked-example 3.4(a)
Calculate the volume occupied by 3.5 moles of ammonia gas,
at s.t.p. Solution |
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Volume of gas = 78.4dm3 |
✍ Worked-example 3.4(b)
Calculate the volume occupied by the following gases at s.t.p: [RAM: H = 1, C = 12, N = 14, O = 16,], [NA = , 1 mole gas occupies 22.4dm³ at s.t.p] |
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(a) |
8.8 g carbon dioxide,
Solution Step 1: = 0.2mol Step 2: Volume of 8.8 g carbon dioxide, = 4.48dm3 |
|
(b) |
molecules of oxygen,
Solution Step 1: = 0.25mol Step 2 Volume of oxygen = 5.6dm3 |
■ Summary of relationship between the number of moles of compound with the number of particles, particle mass and gas volume.
✍ Worked-example 3.4(c)
Calculate the volume occupied by the following gases at s.t.p. [Molar volume at s.t.p = 22.4dm3, NA = , H = 1, C = 12, O = 16, N = 14, Cl = 35.5, Ne = 20] |
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(a) |
0.5 g of neon , Ne. Solution Step 1: = 0.025mol Step 2: Volume of 0.5 g neon = 0.56dm3 |
|
(b) |
1.5 moles of carbon dioxide,
Solution : Volume of 1.5 moles of = 33.6dm3 |
|
(c) |
molecules Chloride,
Solution Step 1: = 0.08mol Step 2: Volume of = 1.792dm3 |
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