Which of the following is an example of an observation? a. Paraffin wax begins to melt at 57°C.
b. The force acting on an object is equal to its mass times its acceleration.
c. Gases expand as their temperature increases because the gas molecules are moving more rapidly.
d. Will all waxes melt at the same temperature?
e. Three samples of wax are heated to 75°C.

Steam reforming of methane ( ch4) produces "synthesis gas," a mixture of carbon monoxide gas and hydrogen gas, which is the starting point for many important industrial chemical syntheses. an industrial chemist studying this reaction fills a 1.5 l flask with 3.5 atm of methane gas and 1.3 atm of water vapor at 43.0°c. he then raises the temperature, and when the mixture has come to equilibrium measures the partial pressure of carbon monoxide gas to be 1 .0 atm. calculate the pressure equilibrium constant for the steam reforming of methane at the final temperature of the mixture. round your answer to 2 significant digits.