Which choice is BOTH an empirical formula and a molecular formula?

H_{2} O

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{F e}_{3} O_{4}

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N_{2} O_{4}

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{N a}_{2} {C l}_{2}

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Solution

The correct option is A $H_{2} O$
The molecular formula is an expression of the number and type of atoms that are present in a single molecule of a substance. It represents the actual formula of a molecule. Subscripts after element symbols represent the number of atoms. If there is no subscript, it means one atom is present in the compound.The empirical formula is the ratio of elements present in the compound. The subscripts in the formula are the numbers of atoms, leading to a whole number ratio between them.

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Similar questions

Q. Which choices among the following are a molecular formula but NOT an empirical formula?

Q. Which of the following statements about molecular and empirical formulas is\ are false?
I. A given compound can have the same, molecular and empirical formula.
II. The molecular formula is a whole number multiple of the empirical formula.
III.

H_{2} O_{2}

represents the empirical formula of hydrogen peroxide.

Q. Which choice is an empirical formula for an ionic compound?

Q. What is empirical formula give an example ? For a compound whose empirical formula and molecular formula are same, give an example.

Give examples of compounds whose
(a) empirical formula is the same as the molecular formula.
(b) empirical formula is different from the molecular formula.

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