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Question

Which of the following correctly represents 360 g of water?

(i) 2 moles of H2O
(ii) 20 moles of water
(iii) 6.022×1023 molecules of water
(iv) 1.2044×1025 molecules of water

(a) (i)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)

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Solution

(ii) 20 moles of H2O = 20×18g=360g of water, because mass of 1 mole of water is the same as its molar mass i, e., 18g

(iv) 1.2044×1025 molecules of water contains
1.2044×1025NA number of moles, NA=6.023×1023
1.2044×10256.022×1023=20 moles

20 moles of water = 20×18 g
= 360 g of water

Hence option D is correct.

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