C4H12 is a hydrocarbon. How many moles of CO2 are produced during the combustion of 3.0 moles of this hydrocarbon? Assume excess Oxygen gas is available.​

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

The velocity of any object depends upon a) the location of the object. b) the location of the observer. c) which measurement tools are used. d) the relative motion of the observer.