Question

A given sample contains 90% of Calcium and the rest is Magnesium. How many atoms of Calcium are present in one gram of this sample? (Molar mass of calcium is 40g).​

Answer 1

Answer:

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Explanation:

Weight of calcium =10 g

Atomic weight of calcium =40 g/g atom

Number of gram atoms of calcium =

40 g/gatom

10 g

=0.25 gram atoms.

The Avogadro's number is 6.023×10

23

atoms/ g atom

The number of atoms of calcium =0.25 gram atoms ×6.023×10

23

atoms/ g atom

≈1.50×10

23

atoms