# Chemistry

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If the molality of a CaCl2 solution is .100 mol/kg, and was made from 500.0 mL of water, how many grams of CaCl2 were needed to make the solution?

Step by step would be appreciated!

• Chemistry -

DrBob222, do you know how to do this?

• Chemistry -

The density of H2O=1g/mL, solve for mass.

mass=density*volume=(1g/mL)*(500mL)=500g or 0.500 kg

m=moles of solute/kg of solvent, solve for moles

(0.100 mol/kg)*(0.500 kg)= moles of CaCl2

moles of CaCl2*(111.0g/mole)= mass of CaCl2

****I'm not Dr. Bob222, but I think this is correct.

• Chemistry -

I'll buy all of that. Something like 5.55 g if I punched in the right numbers

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