1 atom×16.000(the atomic weight of oxygen)16.000 amu2 atoms ×1.008 (the atomic weight of hydrogen)2.016 amumolecular weight of water18.016 amuhydrogen2 atoms ×1.008 amu2.016 amusulfur1 atom × 32.064 amu32.064 amuoxygen4 atoms × 15.999 amu63.996 amumolecular weight98.076 amuhydrogen1 atom ×1.008 amu1.008 amuchlorine1 atom × 35.453 amu35.453 amumolecular weight36.461 amuCHARACTERISTICS OF ATOMSDOE-HDBK-1015/1-93Fundamentals of ChemistryCH-01Rev. 0Page 8Example 1: The compound water has a formula of HO. This means there is one atom of2oxygen and two atoms of hydrogen. Calculate the molecular weight.Solution:The molecular weight is calculated as follows:Example 2:Calculate the molecular weight of HSO .24Solution:Example 3:Calculate the molecular weight of HCl.Solution:Avogadro'sNumberConsider one atom of oxygen and one atom of sulfur, and compare their atomic weights.Oxygen's atomic weight = 15.999 amuSulfur's atomic weight = 32.06 amuThe sulfur atom weighs approximately twice as much as the oxygen atom.(32.06 ÷ 15.99 2)
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