1. A chemist made a new compound and had its elemental composition analyzed. The results of this analysis are shown below. Element Amount C 1.388 g; H 0.345g O 1.850 g a. What is the percent composition of each of the elements in this compound? b. What is the empirical formula for this compound?

Chemical Principles in the Laboratory
11th Edition
ISBN:9781305264434
Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Publisher:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Chapter29: Synthesis And Analysis Of A Coordination Compound
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Activity 12. Challenge!
Directions: Solve the following problems. Show your solution.
1. A chemist made a new compound and had its elemental composition analyzed.
The results of this analysis are shown below. Element Amount C 1.388 g; H 0.345g
O 1.850 g
a. What is the percent composition of each of the elements in this compound?
b. What is the empirical formula for this compound?
2. A chemist finds a salt on the lab bench and determines it is composed of 64.0 g Br
and 9.8 g of Mg.
a. What is the empirical formula of this compound?
b. Review: What is the name of this compound?
c. Review: What are the charges of the two ions in this compound?
3. Ammonia reacts with phosphoric acid to form a compound that contains 28.2%
nitrogen, 8.1% hydrogen, 20.8% phosphorous, and 42.9% oxygen. Calculate the
empirical formula of this compound.
4. Smog is common in cities throughout the world. One component of smog is PAN
(peroxyacylnitrate) which consists of 20.2% C, 2.50% H, 11.4% N, and 65.9% O
by mass. Determine the empirical formula of PAN.
5. Nitroglycerin has the following percentage composition: carbon: 15.87%, hydrogen:
2.22%, nitrogen: 18.50%, oxygen: 63.41%. Determine its empirical formula.
Transcribed Image Text:Activity 12. Challenge! Directions: Solve the following problems. Show your solution. 1. A chemist made a new compound and had its elemental composition analyzed. The results of this analysis are shown below. Element Amount C 1.388 g; H 0.345g O 1.850 g a. What is the percent composition of each of the elements in this compound? b. What is the empirical formula for this compound? 2. A chemist finds a salt on the lab bench and determines it is composed of 64.0 g Br and 9.8 g of Mg. a. What is the empirical formula of this compound? b. Review: What is the name of this compound? c. Review: What are the charges of the two ions in this compound? 3. Ammonia reacts with phosphoric acid to form a compound that contains 28.2% nitrogen, 8.1% hydrogen, 20.8% phosphorous, and 42.9% oxygen. Calculate the empirical formula of this compound. 4. Smog is common in cities throughout the world. One component of smog is PAN (peroxyacylnitrate) which consists of 20.2% C, 2.50% H, 11.4% N, and 65.9% O by mass. Determine the empirical formula of PAN. 5. Nitroglycerin has the following percentage composition: carbon: 15.87%, hydrogen: 2.22%, nitrogen: 18.50%, oxygen: 63.41%. Determine its empirical formula.
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