1) The alcohol we know (ethanol) is produced industrially by the unit operation known as distillation. If 1000 kg (F) of an ethanol-water mixture enter the feed, with a 50% molar alcohol concentration and 750 kg of 95% m/m alcohol (D) need to be produced. The residue (R), therefore, has an alcohol concentration of (MMet = 46 g/mol and MMwater= 18 g/mol)

Select one:

a. 72% m/m.

b. 3% m/m

c. 95% m/m

d. 2 g/mol

e. 5% mole

2) A laboratory student needs 0.015 moles of lead (II) nitrate. How many grams of this reagent should he weigh on the analytical balance to two decimal places?

Data of interest: MW Pb 207 g/mol ; MW N 14 g/mol ; MW O 16 g/mol;

Select one:

a. 4.96 g

b. 4.53 x 10^-5 g

c. 4.53 g

d. 0.49 g