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  • Which of the following correctly represents 360 g of water? (i) 2 moles of H2O (ii) 20 moles of water (iii) 6.022 × 10^23 molecules of water (iv) 1.2044×10^25 molecules of water (a) (i) (b) (i) and (iv) (c) (ii) and (iii) (d) (ii) and (iv)

Which of the following correctly represents 360 g of water?
(i) 2 moles of H_{2}O
(ii) 20 moles of water
(iii) 6.022 \times 10^{23} molecules of water
(iv) 1.2044\times10^{25} molecules of water

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

Answers (1)

Answer: D
Solution.
The average mass of one mole of H_{2}O is 18.02 grams.
The molecular weight of water is 18 g/mol. Hence, one mole of water weighs 18 g. 

One mole of water contains 6.023 \times 10^{23} water molecules.

2 moles of H_{2}O is 36 g (2 \times 18 g) and 20 moles of water is 360g (20 \times 18 g). The mass of 6.022 \times 10^{23} molecules of water is 18g.

Therefore, the mass of 1.2044\times10^{25} molecules (= 20 \times 6.022 \times10^{23} molecules) of water is 20 \times 18g = 360g.

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