Calculate the number of moles present in 34g of Ammonia?

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Solution

The gram molecular mass or molar mass is defined as the molecular mass of a mole of a substance expressed in grams.
The number of moles can be calculated by the the equation
Number of moles = $\frac{Given mass of the substance}{Molecular weight of the substance}$
To find number of moles present in 34g of Ammonia(NH₃)
Given mass of the substance(Ammonia) = 34g
Molecular weight of Ammonia = Molecular weight of Nitrogen + Molecular weight of Hydrogen
= 14 + (1×3) = 14+ 3 =17g/mol
Therefore, number of moles present in 34g of Ammonia(NH₃) = $\frac{34}{17}$ =2 moles.

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