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A solution of salt and water contains 60 grams of water per 120 milliliters of the solution. If 1 mole of water weighs 16 grams, _____ moles of water would be present in 40 milliliters of the solution. [Round off your answer to two decimal places]

Numerical Answers Expected!

 Aug 11, 2014

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 #1
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120 ml solution contains 60 grams water.

40 ml solution is one-third of 120 ml, so it would contain one-third the mass of water, namely 20 grams.

If 20 grams is 1 mole, then 16 grams is 16/20 of a mole, or 4/5 of a mole (or 0.8 mol).

 Aug 12, 2014

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 #1
avatar+33661 
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Best Answer

120 ml solution contains 60 grams water.

40 ml solution is one-third of 120 ml, so it would contain one-third the mass of water, namely 20 grams.

If 20 grams is 1 mole, then 16 grams is 16/20 of a mole, or 4/5 of a mole (or 0.8 mol).

Alan Aug 12, 2014

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