Given the densities of the following pure liquids, what volume of each is necessary to make 250 ml of a 350 mm solution? a. ethanol - 0.789 g/cm? b. acetone -0.791 g/cm c. formic acid - 1.220 g/cm3 d. tert-butylamine - 0.696 g/cm?

Answer :

(a) The volume of ethanol liquid needed are, 2.4 L

(b) The volume of ethanol liquid needed are, 1.9 L

(c) The volume of ethanol liquid needed are, 1.6 L

(d) The volume of ethanol liquid needed are, 1.7 L

Explanation : Given,

Volume of solution = 250 mL = 0.250 L   (1 l = 1000 mL)

Concentration of solution = 350 mM = 0.350 M    (1 mM = 0.001 M)

First we have to calculate the moles of solution.

(a)  For ethanol liquid :

To we have to calculate the mass of ethanol.

Now we have to calculate the volume of ethanol.

(b) For acetone liquid :

To we have to calculate the mass of acetone.

Now we have to calculate the volume of acetone.

(c) For formic acid liquid :

To we have to calculate the mass of formic acid.

Now we have to calculate the volume of formic acid.

(d) For tert-Butylamine liquid :

To we have to calculate the mass of tert-Butylamine.

Now we have to calculate the volume of tert-Butylamine.

they both have a y in them

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.