Chemistry 10th Edition

Published by Brooks/Cole Publishing Co.
ISBN 10: 1133610668
ISBN 13: 978-1-13361-066-3

Chapter 2 - Chemical Formulas and Composition Stoichiometrhy - Exercises - Atomic and Weight Formulas - Page 74: 29

Answer

(a) 1 x Ca = 1 x 40.078 amu = 40.078 amu 1 x S = 1 x 32.066 amu = 32.066 amu 4 x O = 4 x 15.9994 amu = 63.9976 amu _________________________________ FW = 136.142amu (b) 3 x C = 3 x 12.011 amu = 36.033 amu 8 x H = 8 x 1.0079 amu = 8.0632 amu _________________________________ FW = 44.096amu (c) 6 x C = 6 x 12.011 amu = 72.066 amu 8 x H = 8 x 1.0079 amu = 8.0632 amu 1 x S = 1 x 32.066 amu = 32.066 amu 2 x O = 2 x 15.9994 amu = 31.9988 amu 2 x N = 2 x 14.0067 amu = 28.0134 amu _________________________________ FW = 172.207amu (d) 3 x U = 3 x 238.0289 amu = 714.0867 amu 14 x O = 14 x 15.9994 amu = 223.9916 amu 2 x P = 2 x 30.9738 amu = 61.9476 amu _________________________________ FW = 1000.0259amu

Work Step by Step

(a) 1 x Ca = 1 x 40.078 amu = 40.078 amu 1 x S = 1 x 32.066 amu = 32.066 amu 4 x O = 4 x 15.9994 amu = 63.9976 amu _________________________________ FW = 136.142amu (b) 3 x C = 3 x 12.011 amu = 36.033 amu 8 x H = 8 x 1.0079 amu = 8.0632 amu _________________________________ FW = 44.096amu (c) 6 x C = 6 x 12.011 amu = 72.066 amu 8 x H = 8 x 1.0079 amu = 8.0632 amu 1 x S = 1 x 32.066 amu = 32.066 amu 2 x O = 2 x 15.9994 amu = 31.9988 amu 2 x N = 2 x 14.0067 amu = 28.0134 amu _________________________________ FW = 172.207amu (d) 3 x U = 3 x 238.0289 amu = 714.0867 amu 14 x O = 14 x 15.9994 amu = 223.9916 amu 2 x P = 2 x 30.9738 amu = 61.9476 amu _________________________________ FW = 1000.0259amu
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