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Chemistry - Density

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Automobile batteries contain sulfuric acid. Calculate the number of grams of sulfuric acid in 0.500L of battery acid if the solution has a density of 1.28g/mL and is 38% H2SO4 (small numbers) by mass?

Can you please answer this for me?

density = 1.28 g/mL
mass of 1 L is 1.28 g/mL x 1000 mL = ??
?? g x 0.38 = grams H2SO4 in the 1 L
Now calculate mass in 0.5 L.
Post your work if you get stuck.

I am sorry, but that seems easy until I try it..

Do I start with 1.28g/mL and x by 1000, then take that answer and x by 0.38g H2SO4.
I just don't know how to set this up. Sorry, that is why I am asking for help.

1.28 x 1000 x 0.38 x 0.5L/1L = grams of 38% stuff in 1/2 liter.

how do you convert g/mL

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