![]() For calculations, use the given molar mass on the periodic table without rounding. This relationship holds for all elements, since their atomic masses are measured relative to that of the amu-reference substance, 12C. Re: Rounding molar mass on the periodic table. The elements whose atomic masses are written in bracket ( ) are the synthetic elements and their atomic masses values represent the Atomic Mass of the most stable isotope. We search the periodic table to find an element with this molar mass, and notice that oxygen has a molar mass of \(16.00 \ g\), so that is our answer. Note: The Atomic masses are represented in the Atomic mass unit (u). Solution: Since two atoms of this element have a combined molar mass of \(32.00 \ g\), one atom of the element has half of that molar mass, \(16.00 \ g\). Directions: Use the periodic table to fill in the below chart. According to the definition of the mole, 12 g of 12C contains 1 mole of 12C atoms (its molar mass is 12 g/mol). by Jay Atomic mass of all elements (along with the rounded off values) is mentioned in the chart below. ![]() ![]() According to the periodic table, 1 mol of U has a mass of 238.0 g, so the mass of 2 mol is twice that, or 476.0 g. Per the amu definition, a single 12C atom weighs 12 amu (its atomic mass is 12 amu). The periodic table shows that the atomic mass (rounded to two decimal points) of Al is 26.98, so 1 mol of Al atoms has a mass of 26.98 g. (credit: modification of work by Mark Ott).īecause the definitions of both the mole and the atomic mass unit are based on the same reference substance, 12C, the molar mass of any substance is numerically equivalent to its atomic or formula weight in amu. From left to right (bottom row): 32.1 g sulfur, 28.1 g silicon, 207 g lead, and 118.7 g tin. From left to right (top row): 65.4 g zinc, 12.0 g carbon, 24.3 g magnesium, and 63.5 g copper. ![]()
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