calculate the number of oxygen atom in 0.635 gram of calcium
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Explanation:
No. of moles = Mass of substance÷Molar Mass
= 0.635÷40
= 0.015
No. of molecules : No. of Moles x Avagadro's no
= 0.015 x 6.023 x 10²³
= 0.090 x 10²³
No. of atoms = No. of molecules x Atomicity
= 0.090 x 10²³ x 1
= 0.090 x 10²³.
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