H 2 and F 2 react according to the following equation, forming HF. H 2 ( g ) + F

ID: 900479 • Letter: H

Question

H2 and F2 react according to the following equation, forming HF.

H2(g) + F2(g) 2HF(g); H° = –271 kJ

If H2(g) and F2(g) were mixed in a thermally insulated vessel, the reaction that occurred would be

exothermic, and the temperature of the reaction system would rise.

endothermic, and the temperature of the reaction system would rise.

endothermic, and the temperature of the reaction system would fall.

exothermic, and the temperature of the reaction system would fall.

We could not tell unless the original and final temperatures were given.

exothermic, and the temperature of the reaction system would rise.

endothermic, and the temperature of the reaction system would rise.

endothermic, and the temperature of the reaction system would fall.

exothermic, and the temperature of the reaction system would fall.

We could not tell unless the original and final temperatures were given.

H2(g) + F2(g) 2HF(g); H° = –271 kJ

thermally insulated vessel means there is no heat exchange

at the beggining, there is a temperature, lets call it T1

since T1 is low, there is reaction between H2 and F2

there will be produciton of 2HF, and release of heat

The heat will increase the T1

eventually will stop ats a given equilibrium conditions

but in general, you will se an exothermica reaction with a rise in temperature, which is A

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