The exhaust gas of the combustion of liquid methanol with excess air is analysed and the following dry-basis mole percentages are determined: ch3oh 0.52%; co2 - 12 %; and co 1.55%. liquid methanol enters a burner at rate of 15 l min1 and density of 792 kg m3 write the chemical reaction equations of combustion [1 mark] (a) (b) draw the flow diagram of the burner showing all streams and their components. [2 marks] (c) calculate: the theoretical oxygen and air needed (i) (ii) the molar flow rate of the dry exhaust (ii) the flow rate of water in the exhaust (iv) the flue gas composition on a dry basis and the mole fraction of water [3 marks] [4 marks] [2 marks] [4 marks] 1 mark] 1 mark] (v) (vi) the percentage excess air used. the fractional conversion of methanol. (d) how would you process the exhaust gases of the combustion if the process is used for heating of a house?

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.