Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 4 - Reactions in Aqueous Solution - Exercises: 4.68

Answer

0.00295 M

Work Step by Step

One cup has 123mg of ascorbic acid C6H8O6. The volume of one cup is 236.6mL. The concentration here is 123mg/236.6mL = 0.5199 mg/mL. First we convert this to g/L as follows: 0.5199mg/mL * (1000mL/L) * (1g/1000mg) = 0.5199 g/L Now we need to convert this to moles so we need the molar mass of C6H8O6: C has a mass of 12 so 6*12 = 72 H has a mass of 1 so 8*1 = 8 O has a mass of 6 so 16*6 = 96 96 + 8 + 72 = 176 g/mol Then we take the 0.5199g/L and divide by the molar mass: 0.5199g/mL * (1mol/176grams) = 0.00295 mol/L
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