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$8823-6114$

Answer all questions. Answers must be written within the answer boxes provided.

Methanoic acid $(H\frac{C}{O}OH)$ is the first member of the homologous series of carboxylic acids.

$($a$)$ Outline what is meant by the term "homologous series".

$1$

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$($b$)$ Calculate the percentage, by mass, of oxygen in methanoic acid.

$[2]$

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