PRS questions from Lecture 10-26-11 and 10-27-11

# PRS questions from Lecture 10-26-11 and 10-27-11 - 1) What...

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PRS questions from Lecture 10-26-11 1) How many resonance structures exist for the HPO 4 2- ion where the phosphorus has a formal charge of 0 and the oxygens have either a formal charge of 0 or -1? 2) What is the shape (molecular geometry) of BrF 4 + ? (multiple choice) 1. Tetrahedral 2. Square planar 3. See-saw 4. Square pyramidal 5. Trigonal bipyramidal 6. Trigonal pyramidal 7. Trigonal planar 8. Bent 3) Balance the following equation: Al + H 2 SO 4 Al 2 (SO 4 ) 3 + H 2 Provide answer from left to right. If left to right the coefficients were 1,2,2,1 enter 1221 Answers: 1) 3 2) See-saw 3) 2313 2 Al + 3 H 2 SO 4 Al 2 (SO 4 ) 3 + 3 H 2 PRS questions from Lecture 10-27-11

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Unformatted text preview: 1) What is the theoretical yield (in g) of solid sodium oxide (molar mass: 38.99 g/mol) if 12.5 g of solid sodium (molar mass: 22.99 g/mol) was reacted with 9.57 g of O 2 (molar mass: 32.00 g/mol) gas? Report to one decimal place. 2) Consider the following unbalanced reaction equation: Al (s) + HF (g) AlF 3 (s) + H 2 (g) What is the percent yield of aluminum fluoride (molar mass: 83.98 g/mol) if 50.5 g of aluminum fluoride is produced when 30.0 g of aluminum (molar mass: 26.98 g/mol) is reacted with 50.0 g of hydrogen fluoride (molar mass: 20.008 g/mol). Report to one decimal place. Answers: 1. 10.2 g 2. 72.2%...
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## This note was uploaded on 02/20/2012 for the course 160 161 taught by Professor Kim during the Fall '08 term at Rutgers.

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PRS questions from Lecture 10-26-11 and 10-27-11 - 1) What...

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