Atomicity of an element is defined as the number of atoms of an element in its one molecule for ...

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Atomicity of an element is defined as the number of atoms of an element in its one molecule for example atomicity of \( \mathrm{He}, \mathrm{N}_{2} \), \( \mathrm{O}_{3} \) are \( 1,2,3 \) respectively. The atomicity can be determined by calculating experimental value of observed atomic mass and then dividing by its normal atomic mass. Atomic mass of a metal is obtained by Dulong petits law. Atomic mass is the relative mass of atom of an element as compared to the mass of one \( { }^{12} \mathrm{C} \) atom. Average atomic mass of an element is due to the average of masses of its different isotopes.
An element has atomic mass 31 . Mass of \( 1.12 \) litre at STP of vapours of this element weighs \( 6.2 \mathrm{~g} \). The atomicity of this element is:
(A) 4
(B) 2
(C) 6
(D) 8
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