question_answer 26)

Which of the following correctly represents 360 g of water? (i) 2 moles of                                                           (ii) 20 moles of water (iii) 6.022 x 1023 molecules of water                          (iv) 1.2044 x 1025 molecules of water (a) only (i)                           (b) (i) and (iv)                    (c) (ii) and (iii)                    (d) (ii) and (iv)

Answer:

(d) (ii) and (iv) points correctly represent 360 g of water. (ii) From point, 1 mole of water = molar mass of water =18g  20 moles of water = 18 g x 20 = 360g (iv) From point, 6.022 x 1023 molecules of water = 1 mole = 18g of water 1.2044 x 1025 molecules of water Therefore, points (ii) and (iv) represent 360 g of water. Students can check other points also, as (i)1 mole of water = molar mass of water = 18 g of water.                            2 mole of water = 18x2 = 36g (iii) 6,022 x1023 molecules of water =18g water.