Calculate Mass of Paradichlorobenzene for .05 Molal Solution

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To calculate the mass of paradichlorobenzene needed for a 0.05 molal solution in 20.00 ml of cyclohexane, the mass of cyclohexane is first determined using its density. The density of cyclohexane is 0.779 g/ml, which results in a mass of approximately 15.58 g for 20.00 ml. The formula for molality is used, where 0.05 moles of solute per kg of solvent is applied. The calculation shows that 0.11 g of paradichlorobenzene is required. However, the accuracy of this calculation is questioned, indicating a need for verification of the steps involved.
babbagee
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Calculate the mass of paradichlorobenzene (M=147.01g/mol) that should be added to 20.00 ml of cyclohexane (d = .779g/ml) to make a .05 molal solution.

I did this problem but i don't know if i did it correctly.
first i found the mass of cyclohexane by using m=dv.

(.05moles solute/kg solvent)(15.58g)(1kg/1000g)(147.01g/mol) = .11g

does this seem correct. I am not sure.

Thanks.
 
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