Question

calculate no. of moles in 9gm H²O​

Answer 1

Answer:

Molar mass of H2O is 18 .

This means 1 mole of water will weigh 18 grams .

So by unitary method ( as every molecule have equal and independent masses) 0.5 or half mole of water weighs 9 grams

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Answer 2

Answer:

5.265 nco. ..........................