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Gases and ammonia (a) Hydrogen reacts with oxygen to form water vapour - Edexcel - GCSE Chemistry - Question 6 - 2014 - Paper 1
Question 6
Gases and ammonia (a) Hydrogen reacts with oxygen to form water vapour. $$2H_2(g) + O_2(g) → 2H_2O(g)$$ If 200 cm³ of hydrogen react completely with 100 cm³ of ox... show full transcript
Worked Solution & Example Answer:Gases and ammonia (a) Hydrogen reacts with oxygen to form water vapour - Edexcel - GCSE Chemistry - Question 6 - 2014 - Paper 1
Step 1
Step 2
Calculate the maximum volume of hydrogen formed from zinc.
Answer
First, we need to determine how many moles of zinc are in 13.0 g. The molar mass of zinc (Zn) is 65.0 g/mol.
Number of moles of zinc = ( \frac{13.0 \text{ g}}{65.0 \text{ g/mol}} = 0.2 \text{ moles} )
According to the equation, 1 mole of zinc produces 1 mole of hydrogen gas. Therefore, 0.2 moles of zinc will produce 0.2 moles of hydrogen gas.
Next, to find the volume of hydrogen gas produced, we use the fact that 1 mole of gas occupies 24 dm³ at room temperature and pressure.
Volume of hydrogen = ( 0.2 \text{ moles} \times 24 \text{ dm}^3 = 4.8 \text{ dm}^3 )
Thus, the maximum volume of hydrogen formed is 4.8 dm³.