Which of the following could occur as a result of decreasing the heat energy of a gas?
A. condensation
B. evaporation
C. radiation
D. vaporization

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?