Physical Chemistry Answers

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.

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

What is the vapour composition above the mixture of methanol and ethanol?  

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.

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.

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?

A. The conversion of malate into fumarate: 1. Malate) fumarate)+ H₂Om

is endergonic at body temperature, 37°C, AG is 2.93 kJ mol'. In metabolism the

reaction is coupled with

2. fumarate) aspartate()

for which AG is-15.5 kJ mol at 37°C

a. Calculate Keg for reaction 1.

b. Calculate Ke, for reaction 2.

Predict whether the following reaction would proceed spontaneously as written 298K.

Co + Fe2+ -> CO2+ + Fe

Given that [Co2+]=0.15M and [Fe2+]=0.68M

Co2+ + 2e- ->Co E°=-0.28V

Fe2+ + 2e- -> Fe E°=-0.44

What is the potential of a cell made up of Zn/Zn2+ and Cu2+/Cu, half cell at 76°c. If [Zn2+]=0.25M and [Cu2+]=0.15M

Given that Zn/Zn2+ E°=-0.76V, Cu2+/Cu E°=0.34

A zinc electrode is submerged in an acidic 0.80M Zn+ solution which are connected by salt bridge to a 1.30M Ag+ solution containing a silver electrode. Determine the initial voltage of the cell at 298k

Given that:

Zn/Zn2+ E°=0.76V

Ag+/Ag E°=0.80V