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 - Mixed Examples - Page 78: 91

Answer

The mass of calcium carbonate=2.95g

Work Step by Step

The molar mass of Ca=40.708amu The molar mass of Calcium carbonate=100.0869 The percent composition of calcium in calcium carbonate: Percent composition of calcium=$\frac{\text{molar mass of calcium}}{\text{molar mass of calcium carbonate}}\times100=\frac{40.708}{100.0869}\times100\approx40.67\%$ Recommended daily dietary allowance of Calcium in grams=$1200mg\times\frac{1g}{1000mg}=1.2g$ Let the mass of calcium carbonate be $x$ Mass of calcium=mass of calcium carbonate$\times$ Percent composition of Calcium $1.2g=x\times40.67\%$ $x=\frac{1.2g}{40.67\%}\approx2.95g$ The mass of calcium carbonate=2.95g
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