The relative molecular mass of water is 18. This means a mass of 36 g of water contains...
I 2 molecules of water
II 2 moles of water
III 2 moles ions of water
IV 2 x 6.02 x 10^23 molecules of water
A IV only
B I and IV only
C II and IV only
D II and III only
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The answer is C
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