Ch 6 Stoichiometry

# Ch 6 Stoichiometry - phosphorus? M w of P 4 = 123.9 g/mol,...

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Chapter 6 Problems Chemistry 101 Dr. Nielson 1. Balance the reactions. a. (NH 4 ) 3 PO 4 + Ca(NO 3 ) 2 ---------> Ca 3 (PO 4 ) 2 + NH 4 NO 3 b. P + O 2 ---------> P 2 O 5 2. Gaseous CS 2 is formed when C reacts with SO 2 gas. CO is the other product. a. Write a balanced equation for the reaction. b. How many moles of CS 2 can be produced by the reaction of 17.3 moles of C with excess SO 2 ? 3. Solid phosphorus P 4 and chlorine gas Cl 2 react to produce a liquid, PCl 3 . Crazy reaction. P 4 is very pyrophoric and Cl 2 is a pulmonary irritant. Think lungs on fire. a. Write a balanced equation for the reaction. b. Classify the reaction: combination, decomposition, single-replacement, or double- replacement? c. How much chlorine, in grams, is necessary to completely react with 1.45 g

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Unformatted text preview: phosphorus? M w of P 4 = 123.9 g/mol, M w of Cl 2 = 70.90 g/mol, M w of PCl 3 = 137.3 g/mol 4. Calculate the molecular mass of acetic acid, CH 3 CO 2 H. 5. How many moles of S are in 0.56 moles of Al 2 S 3 ? 6. How many oxygen atoms are in 8.621 moles of hydrogen peroxide, H 2 O 2 ? 7. How many moles of Fe(OH) 3 are there in 2.47 g of Fe(OH) 3 ? 8. How much do 11.2 moles of Pb weigh in kilograms? Key 1.a. 2 (NH 4 ) 3 PO 4 + 3 Ca(NO 3 ) 2---------> Ca 3 (PO 4 ) 2 + 6 NH 4 NO 3 1.b. 4 P + 5 O 2---------> 2 P 2 O 5 2.a. 5 C(s) + 2 SO 2 (g) ---------> CS 2 (g) + 4 CO(g) 2.b. 3.46 moles CS 2 3.a. P 4 (s) + 6 Cl 2 (g) ---------> 4 PCl 3 (l) 3.b. combination 3.c. 4.98 g Cl 2 4. 60.05 g/mol 5. 1.7 moles S 6. 1.038 x 10 25 O atoms 7. 0.0231 mol Fe(OH) 3 8. 2.32 kg Pb...
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## This note was uploaded on 03/08/2012 for the course CHEM 101 taught by Professor Anderson,w during the Fall '08 term at BYU.

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Ch 6 Stoichiometry - phosphorus? M w of P 4 = 123.9 g/mol,...

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