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# (a) The molecular formula of acetylsalicylic acid ISBN: 9780321809247 1

## Solution for problem 90 Chapter 3

Chemistry: A Molecular Approach | 3rd Edition

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Problem 90

(a) The molecular formula of acetylsalicylic acid (aspirin), one of the most common pain relievers, is C9H8O4. How many moles of C9H8O4 are in a 0.500-g tablet of aspirin? (b) How many molecules of C9H8O4 are in this tablet? (c) How many carbon atoms are in the tablet?

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Step-by-step solution Step 1 of 3 Aspirin : Aspirin is a salicylate (sa-LIS-il-ate). It works by reducing substances in the body that cause pain, fever, and inflammation. Aspirin is used to treat pain, and reduce fever or inflammation. It is sometimes used to treat or prevent heart attacks, strokes, and chest pain (angina). Aspirin should be used for cardiovascular conditions only under the supervision of a doctor molar mass is the mass of a given chemical element or chemical compound (g) divided by the amount of substance (mol). The molar mass of a compound can be calculated by adding the standard atomic masses (in g/mol) of the constituent atoms. the chemical formula for aspirin is C9H8O4 the molar mass of an element is it's atomic mass rounded to the nearest whole number, so: c- 12 h- 1 o - 16 now multiply these number by how many of each there are in the formula: c - 12 x 9 = 108 h - 1 x 8 = 8 0 - 16 x 4 = 64 add these numbers up 108 + 8 + 64 = 180 so 180g. Step 2 of 3 Avogadro’s number Avogadro's number, number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.022140857 × 10 . The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction (if any).

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##### ISBN: 9780321809247

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