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Chemistry

Pratik heated 11.2 grams of element ‘M’ (atomic weight 56) with 4.8 grams of element ‘N’ (atomic weight 16) to form a compound. Find the empirical formula of the compound obtained by Pratik.

Mole Concept

ICSE Sp 2025

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Answer

To find the empirical formula, we determine the simplest whole-number ratio of the atoms of elements 'M' and 'N'.

Number of moles of M = Given massAtomic weight=11.256=0.2 moles\dfrac{\text{Given mass}}{\text{Atomic weight}} = \dfrac{11.2}{56} = 0.2\text{ moles}

Number of moles of N = 4.816=0.3 moles\dfrac{4.8}{16} = 0.3\text{ moles}

Molar Ratio (M : N) = 0.2:0.3=2:30.2 : 0.3 = 2 : 3

∴ The empirical formula is M2N3.

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