# chem

density of 20% by mass C2H6O2 solution in water is 1.03 g/mL. find the molarity of the solution.

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asked by lily
1. 20% by mass means 20 g C2H6O2 in 100 g soln.
moles C2H6O2 = 20/molar mass.
100 g soln. Use density to convert to L, then
M = moles/L

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2. can i know ur answer bcus i got diff. from the actual ans,3.32M but i get 63.93 M.
if im wrong could you show me the conversion value to L (0.9709L) and the moles (62.07 mol).(is my calculation)

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posted by lily
3. 62.07 is the molar mass, not the moles.
moles = 20.0g/molar mass = ??
100 mL/1.03 g/mL is 97.09 mL which is 0.09709 L.

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4. thanks...

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posted by lily

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