Question

90 g. of water contains how many moles !
a) 6.02 x 1023
b) 90
c) 5
d) 1
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Answer 1

Explanation:

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Answer 2

1 mole of water contains (2x1 + 16x1) = 18 g of water
conversely,
18g of water contains 1 mole of water molecules
=>90g of water contains = 1/18 × 90 moles of water
= 5 moles of water molecules.


Hence, the correct ans is : c) 5

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