ICSE Class 10 Chemistry 2015 Solved Paper

Complete the following calculations. Show working for complete credit :

Question : 11

Total: 85

Calculate the mass of Calcium that will contain the same number of atoms as are present in 3.2‌gm of Sulphur.
[Atomic masses: S=32,Ca=40 ]

Solution:

32‌gm‌ of Sulphur ‌‌=1‌mole
∴‌‌3.2‌gm‌ of Sulphur ‌‌=‌

×3.2
‌=0.1‌moles
At. Mass of Calcium =40
∴ mass of 0.1 mole of Ca
=40×0.1=4 ‌gm

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