please help solve 1,2,3 1. What is the maximum mass of ethyl alcohol you could b
ID: 1869462 • Letter: P
Question
please help solve 1,2,3
1. What is the maximum mass of ethyl alcohol you could boil with 1200 J of heat, starting from 30°C? 2. A container holds 2.0 g of oxygen at a pressure of 7.0 atm. (A) How much heat is required to increase the temperature by 100°C at constant pressure? (B) How much will the temperature increase if this amount of heat energy is transferred to the gas at constant volume? 3. Perspiration is one of your body's strategies to keep you from overheating. To evaporate your sweat (change phase), requires heat... and that heat is removed from your body. Evaporation is much like boiling, only water's heat of vaporization at 35 °C (body temperature) is 24 105 J/kg, because more energy is required to break molecular bonds at lower temperatures than is required to break them at 100°C. If you sweat at a rate of 25 g/minute and it all evaporates (thanks to Arizona's dry heat), at what rate will you lose body heat?Explanation / Answer
1) Solution: specific heat for ethyl alcohol= 2400 J/kg*K
boiling point of ethyl alcohol= 78 deg C
heat of transformation for ethyl alcohol= 8.79*10^5 J/kg
1200=m*2400*(78-30)+m*(8.79*10^5)
m(994200)=1200
m=1200/994200
=1.21*10^-3kg
m=0.97gram
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