The numerical values of molar mass and relative molar mass are identical when the former is expressed in

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$mg {mol}^{- 1}$

$cg {mol}^{- 1}$

$kg {mol}^{- 1}$

$g {mol}^{- 1}$

answer is B.

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Detailed Solution

Because of the way in which the mole is defined, for every element the number of grams in a mole is the same as the number of atomic mass units in the atomic mass of the element. For example, the mass of 1 mol of magnesium (atomic mass = 24.305 amu) is 24.305 g

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