If you knew the molarity and the volume of a solution, what other piece of infor

Question

If you knew the molarity and the volume of a solution, what other piece of information would you need to know to be able to calculate its molality? Select one: O a. the mass of solvent used to make the solution O b, the density of the solvent O c. the mass of solute O d. the number of moles of solute used to make the solution Heptane (CH16) is insoluble in water. Which choice best explains why water is incapable of dissolving heptane (C7H16)? Select one: O a. Heptane is a molecular compound, rather than an ionic compound. b. Heptane is a nonpolar molecule composed of a long hydrocarbon chain. C. Heptane's long carbon chain gives it a greater dipole moment than water. d. Entropy tends to keep heptane molecules clustered together

Explanation / Answer

1)

using molarity and volume, we can calculate number of mol of solute

number of mol = molarity * volume

we have:

molality = number of mol / mass of solvent in Kg

so, we need mass of solvent as well

Answer: a

2)

heptane is non polar due to hydrocarbon chain and water is polar.

So, heptane is not dissolved in water.

Answer: b

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