GCSE Edexcel Chemistry Calculation with gases: Hydrogen-oxygen fuel cells, rath

Hydrogen-oxygen fuel cells, rather than chemical cells, can be used to power some vehicles - Edexcel - GCSE Chemistry - Question 8 - 2021 - Paper 1

Question 8

Hydrogen-oxygen fuel cells, rather than chemical cells, can be used to power some vehicles. (a) Give one advantage of using a hydrogen-oxygen fuel cell, rather than... show full transcript

Worked Solution & Example Answer:Hydrogen-oxygen fuel cells, rather than chemical cells, can be used to power some vehicles - Edexcel - GCSE Chemistry - Question 8 - 2021 - Paper 1

Step 1

Give one advantage of using a hydrogen-oxygen fuel cell, rather than using a chemical cell, to power a vehicle.

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Answer

One advantage of hydrogen-oxygen fuel cells is that they produce a voltage as long as hydrogen and oxygen are supplied, and they do not produce harmful or toxic substances like chemical cells, which require careful disposal after use.

Step 2

Complete the half-equation for the reaction taking place at one of the electrodes in a hydrogen-oxygen fuel cell.

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Answer

The completed half-equation is:

ightarrow 2 ext{H}_2 ext{O}$$

Step 3

Calculate the volume of 48g of oxygen at room temperature and pressure.

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Answer

To calculate the volume of 48g of oxygen at room temperature and pressure:

First, determine the number of moles of oxygen:

$ext{moles of oxygen} = \frac{48g}{16g/mol} = 3 ext{ mol}$
Next, use the molar volume of gas at room temperature and pressure, which is 24dm³ per mole:

$ext{Volume} = 3 ext{ mol} \times 24 ext{ dm}^3/ ext{mol} = 72 ext{ dm}^3$

Therefore, the volume of 48g of oxygen is 72 dm³.

Hydrogen-oxygen fuel cells, rather than chemical cells, can be used to power some vehicles - Edexcel - GCSE Chemistry - Question 8 - 2021 - Paper 1

Worked Solution & Example Answer:Hydrogen-oxygen fuel cells, rather than chemical cells, can be used to power some vehicles - Edexcel - GCSE Chemistry - Question 8 - 2021 - Paper 1

Give one advantage of using a hydrogen-oxygen fuel cell, rather than using a chemical cell, to power a vehicle.

Complete the half-equation for the reaction taking place at one of the electrodes in a hydrogen-oxygen fuel cell.

Calculate the volume of 48g of oxygen at room temperature and pressure.

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