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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Transcribed Image Text:If 20.0 grams of Ca combines completely with 16.0 grams of S to form a compound,
what is the percent composition of Ca in the compound?
A) 1.25%
B) 55.56%
C) 20.00%
D) 80.00%
E) 44.40%
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Transcribed Image Text:One mole of gas = 22.4 L only at
%3D
1. 0°C and 1 atm pressure
2. 32°C and one atm pressure
3. 0°K and one atm pressure
4. 0°F and one atm pressure
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Expert Solution

Step 1
Percent composition of Ca in CaS = (mass of Ca/mass of CaS) × 100%
Mass = moles × molar mass
Molar mass of CaS = 72 g/mol
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