Heptane is used in gasoline/automobile engineering as a standard with an "octane rating" of 0. The standard molar enthalpy of formation of n-heptane C7H16(l) is -187.9 kJ/mol. For the balanced reaction equation of heptane use: C7H16(l) + 11O2 --> 7CO2 + 8H2O.

Heptane is a liquid, but all the other chemicals in this reaction are gases. What is the enthalpy change of this reaction in kJ/mol?

Which formula can be used to calculate the molar mass of hydrogen peroxide

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.

What are the advantages of using the metric system? designed as a decimal system making conversions simpler more accurate system of measurement has prefixes that correspond to an amount to use with all base units used by the entire scientific community