Atank containing 45 kg of liquid water initially at 45oc has one inlet and one exit with equal mass flow rates. liquid water enters at 45oc and a mass flow rate of 270 kg/h. a cooling coil immersed in the water removes energy at a rate of 7.6 kw. the water is well mixed by a paddle wheel so that the water temperature is uniform throughout. the power input to the water from the paddle wheel is 0.6 kw. the pressures at the inlet and exit are equal and all kinetic and potential energy effects can be ignored. plot the variation of water temperature with time.
determine the t(t) of the tank.

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.

your answer is c) plasma

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