If a wheelchair-marathon racer moving at 13.1 miles per hour expends energy at a rate of
655 calories per hour, how much energy in calories would be required to complete a marathon race
(26.2 miles) at this pace?

What are the major products produced in the combustion of c10h22 under the following conditions? write balanced chemical equations for each. a. an excess of oxygen b. a slightly limited oxygen supply c. a very limited supply of oxygen d. the compound is burned in air

What does the process of natural selection involve

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.