Correct the following statements:

(a) A molecular formula represents an element.

(b) Molecular formula of water ( $H_{2} O$ ) represents 9 parts by mass of water.

(c) A balanced equation obeys the law of conservation of mass and so does an unbalanced equation.

(d) A molecule of an element is always monoatomic.

(e) CO and Co both represent cobalt.

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Solution

(a) A molecular formula represents the molecule of an element or of a Compound.

(b) The molecular formula of water (H₂O) represents 18 parts by mass of water.

(c) A balanced equation obeys the law of conservation of mass wherever unbalanced equation does not obey this law.

(d) A molecule of an element may be mono, di or polyatomic

(e) CO and Co represent carbon-monoxide and cobalt respectively

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