Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN: 9781938168390
Author: Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher: OpenStax
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Textbook Question
Chapter 3, Problem 33E
Calculate the following to four significant figures:
- the percent composition of ammonia, NH3
- the percent composition of photographic fixer solution (“hypo”), Na2S2O3
- the percent of calcium ion in Ca3(PO4)2
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Calculate the following to four significant figures:(a) the percent composition of ammonia, NH3(b) the percent composition of photographic fixer solution (“hypo”), Na2S2O3(c) the percent of calcium ion in Ca3(PO4)2
1) Glucose has the formula C6H12O6. What is the percent composition of oxygen in glucose to three significant digits?
2) A sample of a pure compound contains 68.4% chromium and 31.6% oxygen by mass. What is the empirical formula of this compound? (numbers entered will be considered subscripts)
3) What is the molecular formula of a compound with the empirical formula CH2 if the molecular mass of the compound is 56.10 g/mol?
What is the percentage composition of each element in ammonia, NH3?
82.35% N; 17.65% H
80.55% N; 19.45% H
79.46% N; 20.54% H
78.57% N; 21.43% H
Chapter 3 Solutions
Chemistry by OpenStax (2015-05-04)
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