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can someone help me with this please? i've been stuck on this one forever...

A solution is made by mixing 25.0 mL of toluene C6H5CH3d=0867gmL with 135.0 mL of benzene C6H6d=0874gmL. Assuming that the volumes add upon mixing, the molarity (M) and molality (m) of the toluene are

M and m.

  • chemistry -

    I don't see a decimal in the density tabulations. That may be your first problem. The density of toluene is 0.867 that of benzene is 0.879 g/mL.

    First, let's do some housekeeping.
    mass toluene = 25.0 mL x 0.867 g/mL = 21.675 g
    moles toluene = 21.675/92.14 = 0.235 moles.

    mass benzene = 135.0 mL x 0.874 g/mL = 117.99 g

    molality = moles solute/kg solvent
    0.235/0.11799 = ??m, then round to 3 significant figures.

    molarity = moles solute/L soln
    0.235/(0.0250 + 0.1350) = 0.235/?? = xxM, then round to three s.f.
    Check my work.

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