What volume of gas released during the interaction of one mole of the sodium peroxide with an excess of carbon dioxide? Answer indicate in liters to
the nearest tenth.
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Answer:
The molar volume can be used in calculations involving the masses of solids, and volumes of gases, in reactions.
Calculating a volume from a mass
Worked example
4.6 g of sodium reacts completely with excess water:
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
Calculate the volume of hydrogen produced. (Ar of Na = 23, molar volume = 24 dm3)
Step 1 - Calculate the amount of sodium
Amount in mol =
Amount in mol =
Amount of sodium = 0.20 mol
Step 2 - Find the amount of hydrogen
From the balanced equation, the mole ratio Na:H2 is 2:1
Therefore 0.20 mol of Na produces = 0.10 mol of H2
Step 3 - Calculate the volume of hydrogen
Volume = amount in mol × molar volume
Volume = 0.10 × 24
= 2.4 dm3
hope it helps you
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