Chemistry 9th Edition

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

Chapter 1 - Chemical Foundations - Exercises - Page 36: 46

Answer

a. Yes, they are the same b. 1.00 oz troy c. 7.72 grains ap or 0.386 scruples d. 1.296 grams

Work Step by Step

a. $\text{1 grain ap} \times \frac{\text{1 scruple}}{\text{20 grain ap}}\times \frac{\text{1 dram ap}}{\text{3 scruples}}\times \frac{\text{3.888g}}{\text{1 dram ap}}$ = 0.06480 g We also know from question 45 that 1 grain troy = 0.06480 g Thus, the two are the same. b. $\text{1 oz ap} \times \frac{\text{8 dram ap}}{\text{1 oz ap}}\times \frac{\text{3.888 g}}{\text{1 dram ap}}\times \frac{\text{1 oz troy}}{\text{31.1 g}}$ = 1.00 oz troy c. $5.00 \times 10^{2}\text{ mg} \times \frac{\text{1 g}}{\text{1000 mg}}\times \frac{\text{1 dram ap}}{\text{3.888 g}}\times \frac{\text{3 scruples}}{\text{1 dram ap}}$ = 0.386 scruples $0.386\text{ scruples} \times \frac{\text{20 grains ap}}{\text{1 scruple}}$ = 7.72 grains ap d. $\text{1 scruple} \times \frac{\text{1 dram ap}}{\text{3 scruples}}\times \frac{\text{3.888 g}}{\text{1 dram ap}}$ = 1.296 g
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