Which is the best chemical (CaCl_2, or NH_4CI) to be used in Hot-hands? Explain.

Question

Which is the best chemical (CaCl_2, or NH_4CI) to be used in Hot-hands? Explain. Would either of these chemicals be useful as a sports cold pack? Explain. If the sun were used as a source of heat to warm the water of a swimming pool, how much heat from the solar energy would be stored in a 750 L pool whose temperature was increased from 23.0 degree C to 82.5 degree C? Suppose you had a cup of coffee or tea this morning, wherein you consumed 250 mL of coffee or tea (hot water) at 78.5 degree C, and that this amount was cooled by your body to normal body temperature 37degree C (98.6 degree F). How many calories of heat were supplied to your body?

Explanation / Answer

Hot Hands are the material that provide heat and makes warm.

The CaCl2 on reaction with water releases enormous heat.

Thus, CaCl2 is best

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