Which of the following correctly represents 360 g of water? (i) 2 moles of water (ii) 20 moles of water (iii) 6.023xx10^(23) molecules of water (iv) 1.2044xx10^(23) molecules of water

Which of the following correctly represents 360 g of water? (i) 2 mol

1.	Which of the following correctly represents 360 g of water? (i) 2 moles of water (ii) 20 moles of water (iii) 6.023xx10^(23) molecules of water (iv) 1.2044xx10^(23) molecules of water
Answer» (i) only (i) and (iv) (ii) and (iii) (ii) and (iv) Solution :HINT : (i) 2 moles of water Mass of 1 mole of water = 18 g `therefore " mass of 2 moles of water"` `=18xx2=36g` (ii) 20 moles of water Mass of 1 mole of water = 18 g `therefore"Mass of 20 moles of water"` `=18xx20=360g` (iii) `6.023xx10^(23)" MOLECULES of water "=1` mole = 18 g (iv) `1.2044xx10^(25)" molecular of water "6.023xx10^(23)" molecules of water "="1 mole"` `therefore 1.2044xx10^(25)" molecules"` `=(1)/(6.023xx10^(23))xx1.2044xx10^(25)` = 20 moles `therefore"Mass of 20 moles "=20xx18=360g` So (d) is correct.