The next three questions pertain to the complete combustion ofethyl acetate unde

Question

The next three questions pertain to the complete combustion ofethyl acetate under constant pressure: CH3COOC2H5(l) + 5O2(g) ®4CO2(g) + 4H2O(l)    H= -2238.1 kJ/mol How much heat is given off during the reaction,per mole of carbon dioxide produced?
Heat relates to the change of thermal energy, while Hrelates to the change in chemical energy. The two are equal inmagnitude, but opposite in sign. Note that the H value isper mole of the reaction as written.
How much heat is given off when 25.9 g of ethylacetate is burned in excess oxygen?
The burning ethylacetate from the previous question is used to heat 5.1 L of waterat 22.5°C. What would be the final temperature of the water?Assume all the heat produced in the last question is absorbed bythe water. Enter your answer in degrees Celsius, without units.
CH3COOC2H5(l) + 5O2(g) ®4CO2(g) + 4H2O(l)    H= -2238.1 kJ/mol Heat relates to the change of thermal energy, while Hrelates to the change in chemical energy. The two are equal inmagnitude, but opposite in sign. Note that the H value isper mole of the reaction as written.

Explanation / Answer

a) 2238.1 kJ/ 4 = 559.52 kJ b) 24.9 g *(1mol/88.105 g) * (2238.1 kJ/mol) = 632 kJ c) Q = m*C*T C= 4.18 J/g/C T = Tfinal - Tinitial = Q/(m*C) = (632e3 J)/(5.1 L*(1000 g/L)*4.18 J/g/C) = 29.69 C Tinal = Tinitial + 29.69 = 52.2 C

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