Methane gas $({CH}_{4})$ when burns with oxygen $(O_{2})$ gives carbon dioxide and water. Write the balanced chemical equation and provide the following information in terms of reactants and products in the equation. [5 Marks]

(a) no. of molecules
(b) no. of moles
(c) molar mass
(d) total mass of reactants and products
What does statement (d) infer?

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Solution

Balanced chemical reation: 1 Mark
Each part: 1 Mark

1. The balanced chemical equation is:

${CH}_{4} (g) + 2 O_{2} (g) \to 2 H_{2} O(l) + {CO}_{2} (g)$

Methane + Oxygen $\to$ Water + Carbon dioxide
2.

Statement (d) infers that law of conservation of mass is obeyed.

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