Use the following information to answer Question 2 Given the following combustio
ID: 704529 • Letter: U
Question
Use the following information to answer Question 2
Given the following combustion reactions:
Reaction I
C4H8(g) + 6 O2(g) ?4 CO2(g) + 4 H2O(g) ?rH=-2716.8 kJ
Reaction II
C2H4(g) + 3 O2(g) ?2 CO2(g) + 2 H2O(g) ?rH=-1410.8 kJ
2. Calculate the enthalpy of reaction for the cracking of butene, as represented by the following equation.
C4H8(g) ?2 C2H4(g) ?rH=?
3. In an experiment, a student heated 550 g of water from 25oC to 91oC using 0.13 g of glycerol monostearate, an emulsifying agent used in the production of margarine. If it is assumed that all the heat energy was absorbed by the calorimeter water, calculate the experimental enthalpy of combustion for glycerol monostearate in kJ/g.
Use the following information to answer Question 4.
Nitrogen monoxide gas, which is used to treat some pulmonary diseases, is transported in pressurized gas cylinders. Nitrogen monoxide gas is produced by reacting ammonia gas and oxygen gas, as represented by the following equation.
4 NH3(g) + 5 O2 (g)? 4 NO(g) + 6 H2O(g)
4. Calculate the standard enthalpy of reaction for the above equation.
Use the following information to answer Question 5.
Cyclopropane combusts according to the following reaction
2 C3H6(g) + 9 O2(g) ? 6 CO2(g) + 6 H2O(g) ?rH° = - 3918.4 kj
5. Calculate the standard molar enthalpy of formation for cyclopropane.
Given the following combustion reactions:
Reaction I
C4H8(g) + 6 O2(g) ?4 CO2(g) + 4 H2O(g) ?rH=-2716.8 kJ
Reaction II
C2H4(g) + 3 O2(g) ?2 CO2(g) + 2 H2O(g) ?rH=-1410.8 kJ
Explanation / Answer
Ans 2 :
We can use Hess's law , to determine the enthalpy of the desired reaction.
The reaction can be obtained by :
= ( reaction 1 ) + (double of reaction II)
So the enthalpy of reaction :
= (-2716.8) + (2 x 1410.8)
= 104.8 KJ