Question

If mass of one Calcium atom is 5.31*10^-23 . Then how many Calcium atom will be in 1 Kg sample . (Please show the solution with the method) and please, no spam answers.

Answer 1

We KNOW that Avogadro's Number of calcium atoms has a mass of 40.1⋅g. How do we know this? Well, it's printed on the Periodic Table that should be beside you now if you are doing your chemistry homework.

And thus we can use this mass as a measure of the NUMBER of calcium atoms we possess.......i.e.

Number of calcium atoms=27.0⋅g40.1⋅g⋅mol−1×NA, where NA=Avocado's number=6.022×1023⋅mol−1.

=27.0⋅g40.1⋅g⋅mol−1×6.022×1023⋅mol−1.

And we get the answer as a DIMENSIONLESS NUMBER as required.

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