Which of the following samples contains the greatest number of atoms? a. 9 mole of CO2 b. 10 moles of Xe
c. 11 moles of N2O d. 12 moles of CO

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change

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.