Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 3 - Stoichiometry - Active Learning Questions: 3

Answer

a. 2 eggs b. 48 cookies a. 1.2101724642 cups b. number of cookies I will make=48 c. Butter d.0.1198275358 cups

Work Step by Step

(1 dozen eggs is 12, 6 dozen is $6\times12$) Ratio of butter to eggs to cookies made =2:3:6$\times$12 = 2:3:72 a. As I have 1.33 cups of butter, using the ratio to find the number of eggs required: number of eggs needed = $1.33\times \frac{3}{2}$ =1.995 As it is impossible to have .995 of an egg this is rounded up to the nearest whole number Thus number of eggs required = 2 b. Using the above ratio, number of cookies I will make= $1.33\times \frac{72}{2}=47.88$ As it is impossible to make .88 of a cookie this is rounded up to the nearest whole number number of cookies I will make=48 a. As each egg weighs 34.21, Relative number of eggs = $62.1\div34.21=1.8152586963$ Using the ratio, quantity of butter required $=1.8152586963\times\frac{2}{3}$ $=1.2101724642 $ cups b. Using the above ratio, number of cookies I can make = $1.2101724642 \times\frac{72}{3}$ =29.04413914 =29 (nearest whole number) c. Butter. Quantity of butter required as calculated in part a (approx. 1.21) is lesser than the quantity of butter that I have (1.33), thus butter will be left over. d. Subtract the amount of butter used from the amount of butter i have to find the remaining amount of butter: 1.33-1.2101724642=0.1198275358 cups
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