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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?

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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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