chemistry honors
posted by jimmy .
how many grams of a stock solution that is 85% H2SO4 by mass would be needed to make 150 grams of a 45.0 percent solution?

chemistry honors 
bobpursley
you want to dilute it 85/45= 1.889 times?
That means one part acid, .889 parts water.
So what is one part? 150/1.889=about 79grams acid, about 70.2g water.
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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?