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

the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

explanation:

state the principle of separating two immiscible liquids by separating funnel. describe an activity with diagram to separate a mixture of water and kerosene oil. answer: immiscible layers separate out in layers depending on their densities in separating funne