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Chem

posted by on .

A 10.0% by mass H2SO4(aq) solution has a density of 1.07 g·cm-3.

How many milliliters of solution contain 8.34 g of H2SO4?

What mass (in grams) of H2SO4 is in 248 mL of solution?

It's been a while since I have had a chem class...so sorry if this seems really easy I just don't understand how to find it...

  • Chem - ,

    Okay... I think this might help... but I'm really not sure either.

    density=mass/volume
    cm3=mL

    1.volume=mass/density=8.34g/(1.07g/mL)=7.79mL

    2.mass=density*volume=1.07*248=265.36g.

    Here's where I'm confused. Do we have to multiply these two answers by .1 because it's 10% H2SO4 by mass? If that's the case, you can probably take it from here. Hope this helps. Good luck.

  • Chem - ,

    I finally figured it out actually. And yes the .1 has to be multiplied in there. answers end up being 77.93 mL and 26.54g

  • Chem - ,

    77.93 is not right.
    Annon had it right.
    mass = volume x density
    8.34g = volume x 1.07 g/mL
    volume = 8.34/1.07 = 7.79 mL.

  • Chem - ,

    CV

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