Med. cold packs can use various chemicals in Order to produce a cold compress to
ID: 965389 • Letter: M
Question
Med. cold packs can use various chemicals in Order to produce a cold compress to help reduce inflammation caused by injuries. How many grams of potassium chloride would have to be dissolved into 750 g of 200 degree Celsius water to produce 4.0 degree Celsius solution? (Specific heat of water Is 4.184 J/g•degree Celsius) Med. cold packs can use various chemicals in Order to produce a cold compress to help reduce inflammation caused by injuries. How many grams of potassium chloride would have to be dissolved into 750 g of 200 degree Celsius water to produce 4.0 degree Celsius solution? (Specific heat of water Is 4.184 J/g•degree Celsius)Explanation / Answer
heat required to produce a cold compress = m*c*delta T
Q = 750 g*4.184 * (4C - 200C) = - 615048 J
specific heat capacity of potassium chloride = 690 J Kg-1 K-1
q = m*c*deltaT
- 615048 J = (m * 0.690 J/g c * 196 C)
m = 4.54 Kg = 4540 g