Acetylene is used in blow torches, and burns according to the following equation: 2 c2h2(g) + 5 o2(g) → 4 co2(g) + 2 h2o(g). use the following information to calculate the heat of reaction: h f o (h2o(g))= -241.82 kj/mol h f o (co2(g))= -393.5 kj/mol h f o (c2h2(g))=226.77 kj/mol

-2511.18KJ

Explanation:

The heat of reaction is accessible from the heat of formation of reactants and products using the formula below:

ΔH = Σ ΔHf products - Σ ΔHf reactants

Now ,in the specific case of the reaction in the question, 2 moles of acetylene burned in 5 moles of oxygen to yield, 4 moles of carbon (iv) oxide and 2 moles of steam.

It should be noted that the heat of formation of elements is zero and are not taken into consideration when calculating the heat of formation of reaction.

Thus, in this case, the heat of formation of the 5 moles of oxygen is taken as zero.

The heat of reaction is calculated mathematically as follows :

ΔH = [ (4 moles of carbon(iv) oxide × -393.5) + ( 2 moles of water × -241.82)] - [ (2 moles of acetylene × 226.77) + ( 5 moles of oxygen × 0)]

-1574KJ - 483.64KJ - 453.54KJ = -2511.18KJ

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of c is as shown here in the image.

c) should be the answer.