Q - Which of the following has the least weight?
a) 1 gram atom of Na
b) 0.2 mol of sucrose
C) 3 gram molecules of Cu2
d) 1 mol of water
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Answer:
1 mol of water
Explanation:
least weight is &H2O, Water
because
1 mole of sodium is well known to represent a mass of 1 mole of sodium atoms which is 23 grams.
18.02 grams
The average mass of one mole of H2O is 18.02 grams.
Mass of given sample = Molar mass X number of moles m = M X N (a) 0.2 moles of sucrose (C12H22O11): Molar mass of sucrose (C12H22O11) = 342g/mole Thus, the mass of 0.2 moles of sucrose (C12H22O11) = 342 X 0.2 = 68.4g
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