Question

Question:-

Calculate the number of atoms present in:
• 80 amu of Ca

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Answer 1

Answer:

2 atoms

Explanation:

One atom of Calcium (Ca) has 40 amu

So 2 atoms of Ca will have 80 amu.

Answer 2

Explanation:

First calculate the number of moles by divide calcium mass over molar mass of calcium .

n = ms ÷ Met = 80 ÷ 40 = 2mol

No of atoms = No of moles × avogadros no

Nu = n × Na = 2 × 6 × 10 ^ 23 = 1.2 × 10 ^ 24

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