Nitrogen dioxide, no2( g. hf = 33.84 kj/mol), is decomposed according to the following reaction: what is the enthalpy change when 2.50 mol of nitrogen dioxide decomposes? 13.5 kj of energy released 13.5 kj of energy absorbed 84.6 kj of energy released 84.6 kj of energy absorbed

C.

Explanation:

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84.6 kJ of energy released when 2.50 moles of nitrogen dioxide is decomposed.

Explanation:

Energy released when 1 mole of is formed = 33.84 kJ

And When 1 mole of is decomposed it gives out 33.84 kJ of energy.

Energy released when 2.50 moles of nitrogen dioxide is decomposed:

84.6 kJ of energy released when 2.50 moles of nitrogen dioxide is decomposed.

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.

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