Question1 (a) Determine: (i) the balanced reaction equation for a stoichi and pu

Question

Question1 (a) Determine: (i) the balanced reaction equation for a stoichi and pure oxygen (O2). ometric mixture of acetylene (CaH2) 13 Marks) (ii) the Lower Heating Value (LHV) for acetylene, given h, (ClHb) 226.730 kJ/mol. h (H O(vapour)- 241.845 kJ/mol h (CO,)- -393.520 kJ/mol. 14 Marks] (b) A natural gas fuelled gas turbine engine operates with natural gas and air mass flow rates of 2.5 kg/s and 100 kg/s respectively. The natural gas is-comprised of 775 % carbon and 22.5 % hydrogen by mass. Assuming that all of the carbon and hydrogen in the fuel is burned to CO2 and H:O respectively, show that the overall reaction rate equation has the gravimetric form 2.5kg/s gas+ 100kg/s air 7.104kg/s CO,+ 5.063kg/'s H:0+13.633kg/s O+ 76.70kg's N 19 Marks) Element gram-mol masses: m(C)- 12.000 g-mol, m(H)-1.000 g-mol, m(O)- 16.000 g-mol. m(N)-14.000 g-mol. 79 % N2 by mole, and 23.3 % O2 and 76.7 % N2 by mass. The composition of atmospheric air is 21 %0. The empirical chemical formula for a sample of diesel fuel was specified to be Cis sl 128 sOos. Use this formula to obtain the balanced combustion equation for a 0.5 mixture of this Diesel fuel in air. (c) Note: ? is the equivalence ratio for the mixture, and is defined to be ?-afrst/afr Element gram-mol masses: m(C) 12.000 g-mol, m(H)-1.000 g-mol, m(O)-16.000 g-mol. m(N)-14.000 g-mol. The composition of atmospheric air is 21 %0, 79 % N2 by mole, and 23.3 % 02 and 76.7 % N2 by mass. 19 Marks)

Explanation / Answer

a). i. The balanced reaction equationfor a stoichiometric mixture of acetylene and pure oxygen is

2 C2H2 + 5 O2 = 4 CO2 +2 H2O

Just mind that when any hydrocarbon reacts with oxygen carbon dioxide and water are produced. And after that balance the equation that will be very easy for such type of question.

b).

Lower heating value is calculated as sum of enthalpy of combustion product - sum of enthaply of reactant of any combustion equation , so according to the equation of combustion of acetylene shown in above (i) ans is eual to

=4.enthalpy of CO2+ 2. enthalpy of water - 2. enthalpy of acetylene- 5. enthalpy of oxygen

But in that question enthalpy of oxygen is not given which is required.

You can use that equation and solve the problem

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.