Ncert Exercises & Solutions

Calculate the average atomic mass of hydrogen using the following data

Isotope	% Natural abundance	Molar mass
¹H	99.985	1
²H	0.015	2

Many naturally ocurring elements exist as more than one isotope. When we take into account the existence of these isotopes and their relative abundance (per cent occurence), the average atomic mass of the element can be calculated as

Average atomic mass = {(Natural abundance of {}_{1}H \times molar mass) +

(Natural abundance of {}_{2}H \times molar mass of {}_{2}H)} 100

= \frac{99.985 \times 1 + 0.015 \times 2}{100}

= \frac{99.985 + 0.030}{100} = \frac{100.015}{100} = 1.00015 u

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