Question

3.0g of an element contains 1.5055 × 1023 number of its atoms. What is the atomic mass of the element?
24 u
12 u 3 u 6 u

Answer 1

Explanation:

Number of atoms present in W g of a substance =MW×Na.

Here, Na represents Avogadro's number. M represents the atomic mass of substance.

Number of atoms in 4 g He=44×Na=Na

Number of atoms in 46 g of Na=2346NA=2NA

Number of atoms in 0.40 g of Ca=400.4NA=0.01NA

Number of atoms in 12 g of He=412NA=3NA

Hence, 12 g of helium has the maximum number of atoms

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