The heat developed by the combustion of 1m3 of ethane (c2h6, taken at 25 degrees and 1 atm) is used to decompose calcium carbonate to calcium oxide and carbon dioxide. Calculate the mass of calcium oxide that is obtained. H°f CO2 = - 393.5
H°f H2O = - 285.8
H°f CaCO3 = - 1206
H°f CaO = -635
H°f C2H6 = - 83.8

Answer
a) 6.04 kg
b) 20.12 kg
c) 18.86 kg
d) 10.57 kg
e) 14.56 kg

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

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(jacemorris04)