General Chemistry Answers

using standard molar enthalpies of formation given, calculate the standard enthalpy of reaction for the combustion of propane (C3H8) into carbon dioxide and water.

C3H8(g)+5O2(g) = #CO2(g)+ 4H2O(g)

Substance= ΔH°f(kJ/mol)

C3H8(g)= -104.0

O2(g)= 0

CO2(g)= -393.5

H2O(g)= 241.8

the standard enthalpy of formation of liquid ethanol C2H5OH(I), is -227.63 kJ/mol. Calculate the heat of combustion at constant pressure and at constant volume of C2H5OH(I). ΔH°f, CO2= -393.5 kJ/mol; ΔH°f, H2O= -285.4 kJ/mol

C2H5OH(I)+3 O2(g) = 2 CO2(g) + 3 H2O

rapid walking through a distance of 2.2 km for 30 minutes per day requires 41 J while swimming for the same period of time through the same distance requires 226 J. Will these forms of exercise allow you to lose weight equivalent to 1 g of glucose (MW= 180 g/mol) in 1 week? the standard enthalpy of combustion is -2806 kJ.

Draw and describe the formation and structure of the given polymer.

a. sample of organic polymer

b. sample of inorganic polymer

Your space shuttle must land on Earth. You hope your shuttle can survive the landing, but the oxygen tank worries you. The gauge in your 50.0 L O2 tank indicates a pressure of 4000 kPa. The temperature is currently -137.0 ° C, but you would expect it to rise to 695 ° C when it re-enters the atmosphere. The tank was created to withstand a pressure of 7000 kPa. What% of O2 can we keep?

Oxygen is produced by plants during photosynthesis and used by plants and animals for respiration. Predict the chemical amount of oxygen (mol) in 12.0 L of air at TAPN. Suppose the air is 20% oxygen.

Expressed in scientific notation, the chemical amount is a, bc x 10-d mol.

The values ​​of a, b, c and d are respectively..?

Calculate the number of moles of propane in an 8.0 L propane tank at 21.0 ° C and 300 kPa.

The number of moles is a, bc x 10-d.

The values ​​of a, b, c and d are respective….?

A 6.35 L sample of carbon dioxide is collected at 550 ° C and 90.312 kPa. What volume will the gas occupy at 106.391 kPa and 20.0 ° C?

Which of the following aqueous solutions has the lowest concentration of sulfate ion?

A)0.1 M Al₂(SO₄)₃

B)0.2 M MgSO₄

C)0.3 M Li₂SO₄

D)0.4 M K₂SO₄

E)0.5 M CuSO₄

Hi Good day

The question I had was how we could separate the two molecules from the mixed ones. For example, how can we separate the molecules of hydrogen and carbon monoxide?