Monatomic elements, molar mass

The mole is the SI unit for amount. The molar mass, or mass in grams of one mole of an element or compound, is numerically equal to the atomic mass of monatomic elements and the formula mass of compounds and diatomic elements. To find a monatomic element s molar mass, use the atomic mass, but instead of having units of amu, the molar mass will have units of g/mol. So, the molar mass of carbon is 12.01 g/mol, and the molar mass of iron is 55.85 g/mol. How to find the molar mass of compounds and diatomic elements is shown in the next section. 

The molar mass of a monatomic element is the number of grams numerically equal to the atomic mass on the periodic table. 

In addition to O2 and N2, a few other elements (H2, F2, CI2) exist as gases under ordinary conditions of temperature and pressure. The noble gases (He, Ne, Ar, Kr, and Xe) are all monatomic gases. Many molecular compounds are also gases. Table 10.1 T lists a few of the more common gaseous compounds. Notice that all of these gases are composed entirely of nonmetallic elements. Furthermore, all have simple molecular formulas and, therefore, low molar masses. 

Elements. To find the molar mass, look up the atomic mass and note whether the element is monatomic or molecnlar. 

Monatomic elements. The molar mass is the periodic-table valne in grams per mole. ... 

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