General Chemistry Answers

Given the following thermochemical equations and the corresponding enthalpy change for each reaction, calculate the heat of combustion of acetylene gas, C2H2

1. 2C (graphite) + H2 (g)               C2H2(g)      ∆H= + 226.7 kJ
2. C(graphite) + O2 (g)             CO2(g)         ∆H= - 393.5 kJ
3.  H2(g) + ½ O2 (g)            H2O (l)                ∆H= - 285.8 kJ

0.30 mol C3H6O0.30 mol C3H6Othe amount of heat released during the combustion of:

1. 0.30 mol C3H6O
2. 100 g of C3H6O

Write the thermochemical equation for the following reactions that occur at constant pressure:

1. One mole ammonium nitrate dissolve in water to produce aqueous ammonium ion and nitrate ions, accompanied by the absorption of 28.1 kJ of heat
2. Formation of carbon dioxide gas from carbon (graphite) and oxygen, yields 393.5 kJ of heat

If 3.2443 moles of carbon dioxide are produced, how many grams of iron (III) oxalate were reacted if the reaction proceeds with a 99.6% yield?

_{What is cloning? Cite itd advantages and disadvantages}

What is the Ionic Strength of a solution that is 0.8M in HCl and 0.05M of H3PO4

What is the molecular mass of a non-electrolyte solute in a solution that contains 0.6kg of solute and 200g of benzene with a freezing point equal to 5.4°C? The freezing point of pure benzene is 5.53°C/m. The freezing point constant of benzene is 5.12°C.

Photosynthesis in plants converts carbon dioxide and water into glucose and oxygen according to the equation below.

                      6CO₂(_g) + 6H₂O(_l) → C₆H₁₂O₆(_s)  + 6O₂(_g)

Substance

CO₂

H₂O_(l)  

C₆H₁₂O₆(_s)  

O₂(_g)

∆H (kJ/mol)

-393.5

-285.8

-1273.3

S° (J/mol ∙ K)

213.6

69.9

209.2

205.0

Instruction: Calculate the ∆H°, ∆S°, and ∆G°. Is the reaction spontaneous at standard condition?

Photosynthesis in plants converts carbon dioxide and water into glucose and oxygen according to the equation below.

                      6CO₂(_g) + 6H₂O(_l) → C₆H₁₂O₆(_s)  + 6O₂(_g)

Substance

CO₂

H₂O_(l)  

C₆H₁₂O₆(_s)  

O₂(_g)

∆H (kJ/mol)

-393.5

-285.8

-1273.3

S° (J/mol ∙ K)

213.6

69.9

209.2

205.0

Instruction: Calculate the ∆H°, ∆S°, and ∆G°. Is the reaction spontaneous at standard condition?

calculate the mole fraction of the solute in the following solutions:

a. 100 g C2H6O in 100 g H2O

b. 30% HCl solution by mass