Chemistry Answers

7.Determine the composition of a methanol-ethanol mixture over which the equilibrium vapour pressure is 5.0 kPa. Assume that the mixture is ideal.

(Vapour pressure of pure methanol is 8.9 kPa; vapour pressure of pure ethanol is 4.0 kPa)

Report your answer in terms of mole fraction of methanol as a decimal to 3 significant figures. Do NOT include any words, symbols, units or spaces in your answer.

8.Use the information provided in question 7 to answer the question below.

Which statement is true about the composition of the vapour above an equimolar mixture of methanol and ethanol?

a.the vapour component that is in larger proportion depends on temperature

b.the vapour contains more ethanol than methanol

c.the vapour contains more methanol than ethanol

d.the vapour has equal amounts of methanol and ethanol

Determine the composition of a methanol-ethanol mixture over which the equilibrium vapour pressure is 5.0 kPa. Assume that the mixture is ideal.

(Vapour pressure of pure methanol is 8.9 kPa; vapour pressure of pure ethanol is 4.0 kPa)

Report your answer in terms of mole fraction of methanol as a decimal to 3 significant figures. Do NOT include any words, symbols, units or spaces in your answer.

Determine the composition of a methanol-ethanol mixture over which the equilibrium vapour pressure is 5.0 kPa. Assume that the mixture is ideal.

(Vapour pressure of pure methanol is 8.9 kPa; vapour pressure of pure ethanol is 4.0 kPa)

Report your answer in terms of mole fraction of methanol as a decimal to 3 significant figures. Do NOT include any words, symbols, units or spaces in your answer.

calculate the mass of titanium (0.125 cal.g * C) that requires 75.5 cal to heat the metal from 20.5 to 32.0

A star has a mass of 4.3 Msun. Hydrogen gas accounts for 67.9% of the star's mass. What is the mass of all the hydrogen in this star?

Part 2. Processing and Evaluating

1. Draw a table below and record the results of the experiment.

What can you conclude from the result? Support your answer using scientific reasoning.

If you were to repeat the experiment, what would you do to improve it? Why would you do such improvement/modification?

For theta -2 theta X-ray diffraction using Cu K, (lamda = 1.54 A° ) radiation from cubic crystals(a= 3.5 A°). How many diffraction peaks are in the 0°<2theta<90° range?. Give the index of the lattice for each diffraction peaks