Sirius is a blue-white star with a surface temperature of about 9800 k. what is most likely the mass of sirius? 1.0 solar mass 1.4 solar mass 2.0 solar mass 12 solar mass

In 2002, the rare earth elements mine in mountain pass, california was closed because

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.

What is the molar mass of a gas that has density of 2.054 g/l