# Chemistry

How many grams of a stock solution that is 85.5 percent H2SO4 by mass would be needed to make 150 grams of a 45.0 percent by mass solution? Show all of
the work needed to solve this problem.

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1. 85.5% H2SO4 w/w means 85 g H2SO4 + 15 g H2O or 85.5 g H2SO4/100 g solution. How many grams H2SO4 will be in 150 g of that solution?
g H2SO4 = 85.5 x (150/100) = approx 128 but that's an estimate (but close).

How many g H2SO4 will be 150 g of 45% solution. That will be
45 x 150/100 = about 67 (again close) but an estimate.

So you want (128/150) * ? g = 68
? = about 68*150/128 = about 80 g. You would need to add about 70 g H2O to make 150 g total solution. I came out with 78.9 g of the 85.5% H2SO4 original solution.

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posted by David

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