Find the ratio by mass using the ratio of number of atoms in the molecule of $C H_{4}$ .

1:3

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3:1

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1:4

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4:1

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Solution

The correct option is B 3:1
Molecule -- $C H_{4}$
Number of carbon atoms in this molecule is 1
Number of hydrogen atoms in this molecule is 4

Element 1 Element 2

Symbols C H

Ratio by number of atoms 1 4

Atomic mass 12 1

Ratio by mass 12 × 1 = 12 1 × 4 = 4

Simplest ratio 3 1

Simplest ratio = ratio by mass of element 1 : ratio by mass of element 2
= 12 : 4
= 3 : 1

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