Chemistry, 01.10.2019 16:50 trippyjazmine

What is the mass percent composition of oxygen in ethylene glycol, c2h6o2?

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51.554% First, look up the atomic weights of all the involved elements atomic weight carbon = 12.0107 atomic weight hydrogen = 1.00794 atomic weight oxygen = 15.999 Now calculate the molar mass of ethylene glycol m = 2 * 12.0107 + 6 * 1.00794 + 2 * 15.999 = 62.06704 g/mol Since there's 2 oxygen atoms in a single molecule of c2h6o2, calculate the mass of those 2 oxygen atoms. m = 2 * 15.999 = 31.998 g/mol Finally divide the mass of the oxygen by the molar mass of c2h6o2. 31.998 / 62.06704 = 0.515539327 = 51.5539327% Since the lowest number of significant digits I have is for oxygen at 5, round the result to 5 significant figures, giving 51.554%

Answer from: Quest

It's not the same dearthe first one is in grams per mole while the other is not

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.

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