help with chemistry please???

seru1us · #1 (**permalink**) 03-14-2008, 08:47 PM

I need some help with these chemistry questions.... and could you please tell me how you got the answer?? There are a lot more where these came from.
...
A 10.0% aqueous solution of sulfuric acid has a density of 1.0661 grams of milliliters at 20 degrees celcius.

1. how many grams of H2SO4 are found in 50.0 grams of the solution?

2. how many grams of H2SO4 are rewuired to make 50.0 milliliters of the solution.

3. what is the molarity of the solution?

thanks for your time.

steve_geo1 · #2 (**permalink**) 03-14-2008, 08:47 PM

Let the solution be called S.

1. 50.0gS x 10gH2SO4/100gS = 5g H2SO4

2. 50mLS x 1.0661gS/1mLS x 10gH2SO4/100gS = 5.33g H2SO4 to three significant figures

3. 10gH2SO4/100gS x 1molH2SO4/98gH2SO4 x 1.0661gS/1mLS x 1000mLS/1LS = 1.09molH2SO4/1LS, which is molarity to three significant figures.

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