Question

i have a couple of questions Which of the following would not be considered spontaneous?a.cooling a cup of coffee at room temperatureb.ice melting at room temperaturec.compression of gas to fill a tired.water flowing downhillThe molar enthalpy of combustion for one mole of propane is -2202 kJ. There are two ways to express this reaction using chemical equations. Write both types of chemical equations for the forward exothermic reaction. Then draw an enthalpy diagram similar to diagram (a) above. Include reactants, products, and the heat of the reaction. Take a digital picture of your diagram and upload it below.

Answer 1

Remember that spontaneous reactions are those that occur without any external input to the system.

The question is asking for a reaction that will not spontaneous, meaning a reaction that will need an input for it to occur.

The answer should be C, because to compress a gas to fill in the tire, one has to apply some force.

All the other options can happen spontaneously.