9. What is the amount of oxygen in 200.0 mg of an unknown compound, if 100.0 g of the compound contains 49.93 g O? (A) 0.02497 g (C) 24.98 g (B) 0.09986 g (D) 99.86 g 10. What is the thickness of 5.79-mg of gold leaf evenly spread over an area of 44.6 cm2? (Density of gold is 19.3 g/cm³.) (A) 6.73 x 10-6 cm (C) 6.73 x 10³ cm (B) 1.20 × 10³ cm (D) 2.78 x 102 cm

9. What is the amount of oxygen in 200.0 mg of an unknown compound, if 100.0 g of the compound contains 49.93 g O? (A) 0.02497 g (C) 24.98 g (B) 0.09986 g (D) 99.86 g 10. What is the thickness of 5.79-mg of gold leaf evenly spread over an area of 44.6 cm2? (Density of gold is 19.3 g/cm³.) (A) 6.73 x 10-6 cm (C) 6.73 x 10³ cm (B) 1.20 × 10³ cm (D) 2.78 x 102 cm

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".

Question

9. What is the amount of oxygen in 200.0 mg of an
unknown compound, if 100.0 g of the compound
contains 49.93 g O?
(A) 0.02497 g
(C) 24.98 g
(B) 0.09986 g
(D) 99.86 g
10. What is the thickness of 5.79-mg of gold leaf evenly
spread over an area of 44.6 cm² ? (Density of gold is 19.3
g/cm³.)
(A) 6.73 x 10-6 cm
(C) 6.73 x 10³ cm
(B) 1.20 × 10³ cm
(D) 2.78 x 102 cm

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