Acetaminophen, a common aspirin substitute, has the formula C8H9NO2. Determine the number of molecules of acetaminophen in a 500.0 mg tablet.
Monosodium glutamate, known as MSG, is sometimes added to food to enhancce flavor. Analysis determined this compound to be 35.5% C, 4.77% H, 8.29% N, 13.6% Na, and 37.9% O. What is its empirical formula?