Question

calculate the number of moles in a) 1.11 gram of calcium chloride
b) 1.5 into 10^30 molecules of ammonia
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Answer 1

1) 1.11 gram of CaCl2 :- 3 moles (3×Avogadro no. )

2) Moles = 1.5×10^31 / Avogadro's no. = 0.2 × 10^8

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