![]() But what if the chemical formula of a substance is unknown? In this section, we will explore how to apply these very same principles in order to derive the chemical formulas of unknown substances from experimental mass measurements. Conversion from weight percent to For mixtures where weights are given in or fraction. Given the chemical formula of the substance, we were able to determine the amount of the substance (moles) from its mass, and vice versa. 1 amu 1.66054 x 10 -24 grams conversely: 1 gram 6.02214 x 10 23 amu Average Atomic Mass Although the masses of the electron, the proton, and the neutron are known to a high degree of precision ( Table 2.3.1 ), the mass of any given atom is not simply the sum of the masses of its electrons, protons, and neutrons. To convert from g into units in the left column divide by the value in the right column or, multiply by the reciprocal, 1/x. In the previous section, we discussed the relationship between the bulk mass of a substance and the number of atoms or molecules it contains (moles). ![]()
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