Why is the mass of a carbon atom written as 12.011 amu on the periodic table? Why can’t the average atomic mass be a simple average (add masses and divide by 3) of the three naturally occurring isotopes: carbon-12, carbon-13 and carbon-14?

When the volume and number of particles of a gas are constant which of the following is also constant

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call

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.