Chemistry, 19.11.2019 00:31 tonimgreen17p6vqjq

Ethylene (c2h4) is the starting material for the preparation of polyethylene. although typically made during the processing of petroleum, ethylene occurs naturally as a fruit-ripening hormone and as a component of natural gas. the heat of reaction for the combustion of c2h4 is −1411 kj/mol. how many grams of c2h4 must burn to give 70.4 kj of heat?

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Answer from: Brad876

1.40 grams of C2H4 must burn to give 70.4 kJ of heat

Explanation:

The heat of reaction for the combustion of C2H4 is −1411 kJ/mol, means that 1 mol of ethylene releases 1411 kJ. The (-) means that reaction is exothermic.

1st step. Apply a rule of three

1411kJ are released in 1 mol, how many moles of etylene release in 70.4 kJ.

1411 kJ 1 mol

70.4 kJ (70.4 kJ . 1 m) / 1411 kJ = 0.0498 moles

2nd step. Convert the moles in mass, by molar mass

Molar mass ethylene: 28.05 g/m

Molar mass . moles = mass

0.0498 m . 28.05 g/m = 1.40 g

Answer from: Quest

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form( $n_2$ ) .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

Answer from: Quest

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Ethylene (c2h4) is the starting material for the preparation of polyethylene. although typically mad...

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