What is the mass of a solution containing 0.2 molar of sodium chloride

Explanation:

The reaction is FeCl

3+3NaOH→Fe(OH) 3+3NaCl.

Thus, 1 mole of ferric chloride will react with 3 moles of NaOH to form one mole of ferric hydroxide.

0.24 moles of sodium hydroxide will react with 0.08 moles of ferric chloride to form 0.08 moles of ferric hydroxide.

The unreacted amount of ferric chloride is 0.2−0.08=0.12 moles.

In this reaction, sodium hydroxide is the limiting reagent.

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() .

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.