key-eng-fall07-q8059x04

key-eng-fall07-q8059x04 - CHEM 2045C: Quiz 4 Show your work...

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CHEM 2045C: Quiz 4 NAME _____KEY______________ N #_____________ Show your work for full credit Eng Q8059x04 continued All the answers to the different versions are below. Look for your own compounds/masses below. 1. (4 pts) Determine in g/mol the formula weight or molecular weight – as appropriate – for the following: A. copper (II) sulfate Problem 3.21b. CuSO 4 1 pt formula 1 pt FW = 159.609 g/mol A. ammonium phosphate Problem 3.21c. (NH 4 ) 3 PO 4 1 pt formula 1 pt FW = 149.087 g/mol A. aluminum sulfide Problem 3.21e. Al 2 S 3 1 pt formula 1 pt FW = 150.158 g/mol A. iron (III) sulfate Problem 3.21f. Fe 2 (SO 4 ) 3 1 pt formula 1 pt FW = 399.878 g/mol B. dinitrogen pentoxide Problem 3.21a. N 2 O 5 1 pt formula 1 pt MW = 108.010 g/mol B. disilicon hexabromide Problem 3.21g. Si 2 Br 6 1 pt formula 1 pt MW = 535.595 g/mol The key is getting the formula correct. Many people believe they can learn naming and then forget it. Once you learn something, I expect you to retain that knowledge. The early concepts (sig figs,
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key-eng-fall07-q8059x04 - CHEM 2045C: Quiz 4 Show your work...

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