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6. (a) Hydrogen reacts with oxygen to form water vapour - Edexcel - GCSE Chemistry - Question 6 - 2014 - Paper 1
Question 6
6. (a) Hydrogen reacts with oxygen to form water vapour. 2H₂(g) + O₂(g) → 2H₂O(g) If 200 cm³ of hydrogen react completely with 100 cm³ of oxygen, what is the max... show full transcript
Worked Solution & Example Answer:6. (a) Hydrogen reacts with oxygen to form water vapour - Edexcel - GCSE Chemistry - Question 6 - 2014 - Paper 1
Step 1
Maximum volume of water vapour formed
Answer
From the equation, it is clear that 2 volumes of hydrogen react with 1 volume of oxygen to produce 2 volumes of water vapour. Therefore, if 200 cm³ of hydrogen reacts completely with 100 cm³ of oxygen, it will produce:
Thus, the total volume of water vapour produced is equal to the volume of hydrogen reacted, which is 200 cm³.
Therefore, the correct answer is:
❎ B 200 cm³
Step 2
Calculate the maximum volume of hydrogen formed
Answer
To determine the maximum volume of hydrogen formed from the reaction of zinc with hydrochloric acid, we first need to calculate the number of moles of zinc used:
Number of moles of Zn = \frac{\text{mass}}{\text{molar mass}} = \frac{13.0 \text{ g}}{65.0 \text{ g/mol}} = 0.2 \text{ mol}
From the balanced equation, 1 mol of Zn produces 1 mol of H₂. Therefore, 0.2 mol of Zn will yield 0.2 mol of H₂.
The volume of hydrogen produced at room temperature and pressure is given by:
Volume = \text{moles} \times \text{volume per mole} = 0.2 \text{ mol} \times 24 \text{ dm}³/\text{mol} = 4.8 \text{ dm}³
Hence, the maximum volume of hydrogen formed is 4.8 dm³.