Part D You can practice converting between the mass of a solution and mass of so

Question

Part D You can practice converting between the mass of a solution and mass of solute when the mass percent concentration of a solution is known. The concentration of the KCN solution given in Part A corresponds to a mass percent of 0.160 %. What mass of a 0.160 % KCN solution contains 719 mg of KCN? Express the mass to three significant figures and include the appropriate units Hints mass = ahie Submit My Answers Give Up Incorrect; Try Again; 4 attempts remaining You may have incorrectly set up the values in your mass ratio or improperly converted between metric units The mass percent would indicate how many centigrams of solute are in every gram of solution or how many grams of solute are in every hectogram (100 g) of solution. Set up a ratio with mass units that represent the mass percent, then multiply that ratio by the mass of solute so that the units of mass for solute cancell Continue Provide Feedback 9:23 PM

Explanation / Answer

Given

the solution is 0.160% KCN by mass

That means

100g of solution has 0.160g of KCN

Now required mass of KCN = 719mg

= 719mg x 1g /1000mg

= 0.719 g

Thus

0.16g of KCN is present in 100g of 0.16% solution

0.719 g of KCN is present in = 0.719g x 100g /0.160g

= 449.375 g of 0.16% KCN solution

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