A cold pack purchased at a drugstore is a packet of water with a container of sa

Question

A cold pack purchased at a drugstore is a packet of water with a container of salt inside. When the inner salt packet is broken, the ingredients are mixed. If a cold pack was initially at 23.0 degreeC and cools down to 13.2 degreeC after the salt and water mix, which of the following must be true? The mixing process that occurs in the cold pack is endothermic. The mixing process must have a negative AH. The energy of the dissolved salt in the cold pack after the mixing is higher than the energy of the salt before mixing.

Explanation / Answer

When temperature is decreased it indicates reaction has absorbed heat i.e endothermic

Heat is absorbed then reaction delta H is positive.

dH positve means products has more energy than reactants.

Now based on above   the correct statements are ( i) ( iii)

Hence C

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