Can you provide explanations with the steps? An ice calorimeter measures exother

Question

Can you provide explanations with the steps?

An ice calorimeter measures exothermic heat of reaction by the quantity of ice that can be melted. A teaching assistant acquires 0.100 L sample of methane gas, CH4(g), at 25 oC and 744 mm Hg and burns it at constant pressure in air. The heat liberated is captured and used to melt 9.53 g ice at 0oC.

Given following thermodynamic data:

fHo (kJ mol-1) :

H2O (g) -241.8

H2O (l) -285.8

CO2(g) -393.5

CO(g) -110.5 CH4(g) -74.8

vapHo (H2O) = 40.6 kJ mol-1

fusionHo (H2O) = 6.01 kJ mol-1

Specific heat of H2O 4.18 J g-1 oC-1

Specific heat of ice 2.108 J g-1 oC-1

Specific heat of steam 1.1996 J g-1 oC-1 a)

(1 point) Write the equation for complete combustion of methane.

b) (1 point) Calculate the enthalpy for complete combustion of one mole methane.

c) (4 points) Use the above information to determine if the combustion was compete or incomplete.

d) (2 points) Would U for complete combustion of methane be greater than, less than or equal to the enthalpy , H, of combustion. Explain

Explanation / Answer

1)            CH4 (g) +    2O2 (g) -------->    CO2 (g) + 2H2O (l)

2) CH4 (g) +    2O2 (g) -------->    CO2 (g) + 2H2O (l)

      H   =     Hfproducts - Hfreactants

            = [2 x Hf(H2O) + Hf(CO2) ] - Hf(CH4) = {-285.8x2 + (-393.5) -(-78.4) } = -886.7 KJ/Mol

pleaaze post the rest questions separately thanks

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