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Here is where you should use process of elimination (POE) to take an educated guess. Look at this hypothetical question. 1. Which of the following compounds will produce a purple solution when added to water? (A) Brobogdium rabelide (B) Diblythium perjuvenide (C) Sodium chloride (D) Carbon dioxide You should have no idea what the correct answer is because two of these compounds are made up, but you do know something about the obviously wrong answers. You know that sodium chloride, choice (C), and carbon dioxide, choice (D), do not turn water purple.

The identity of an atom is determined by the number of protons contained in its nucleus. The nucleus of an atom also contains neutrons. The mass number of an atom is the sum of its neutrons and protons. Atoms of an element with different numbers of neutrons are called isotopes; for instance, carbon-12, which contains 6 protons and 6 neutrons, and carbon-14, which contains 6 protons and 8 neutrons, are isotopes of carbon. The molar mass given on the periodic table is the average of the mass numbers of all known isotopes weighted by their percent abundance.

Divide each individual mass by the total molar mass to get your percent composition. 50% You can check your work at the end by making sure your percents add up to 100% (taking rounding into consideration). 99% Close enough! Empirical and Molecular Formulas You will also need to know how to determine the empirical and molecular formulas of a compound given masses or mass percents of the components of that compound. , C6H12O6). 4% phosphorus. a) Determine the empirical formula for the compound We start by assuming a 100 gram sample; this allows us to convert those percentages to grams.

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