eng-spring07-q202s

eng-spring07-q202s - CHEM 151: Quiz 2 Show your work for...

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CHEM 151: Quiz 2 NAME KEY ID #_______________ Show your work for full credit Eng Q202 V cm mm mm m mm cm m cm = × × × × = 250 7 25 155 1 1000 100 1 0281 2 2 3 . . . . mass cm g cm gFe = × = 0281 787 1 2 21 3 3 . . . 2 21 1 5585 602214 10 1 2 38 10 23 22 . . . . gFe molFe gFe atomsFe molFe atomsFe × × × = × ( ) ( ) ( ) AW u u u = + + 1000% 100% 1000 3000% 100% 1010 6000% 100% 102 0 . . . . . . 1. (7 pts total) Here is some potentially helpful information about iron, Fe: atomic number = 26, atomic weight = 55.85 u, and density = 7.87 g/cm 3 . a. (2 pts) Determine the volume (in cm 3 ) of a rectangular piece of iron with the dimensions 2.50 cm by 7.25 mm by 1.55 mm . 1 pt for both conversion factors to cm 3 (-½ if they knew to change to cm, but didn’t square) 1 pt answer (-½ for sig figs and units) b. (2 pts) Determine the mass (in grams) of that rectangular piece of iron. 1 pt use of density correctly
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This note was uploaded on 07/10/2011 for the course CHM 2045 taught by Professor Eng during the Fall '10 term at UNF.

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eng-spring07-q202s - CHEM 151: Quiz 2 Show your work for...

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