Type the correct answer in the box. express the answer to three significant figures.
given:
ch4 + 2o2 → co2 + 2h2o, δh = -890 kj/mol
how much energy is released when 59.7 grams of methane (ch4) reacts with oxygen?
the combustion of 59.7 grams of methane releases
kilojoules of energy.

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

Achemist has dissolved a certain substance in water. the chemist knows that more of the substance could be dissolved into the water before it stops dissolving. therefore

Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced.be sure your answer has the correct number of significant digits.