Consider the combustion of octane, a component of gasoline: c8h18(l)+252o2(g)→8co2(g)+9h2o(g) part a calculate δhrxn for the combustion of octane (c8h18) by using average bond energies. express the energy in kilojoules per mole to three significant figures.

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

What causes different colors to appear in the sky? the absorption of light by air molecules the reflection of light by bodies of water the greenhouse effect in earth's atmosphere the scattering and reflection of light by dust particles

Predict the relative bond lengths of the three carbon-oxygen bonds in the carbonate ion (co2−3). what would you expect the charge to be on each oxygen? match the words in the left column to the appropriate blanks in the sentences on the right. make certain each sentence is complete before submitting your answer.