Chapter 3 post quiz w key

Chapter 3 post quiz w key - be 283.89 g/mol. What is the...

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Chapter 4 Post-Quiz Last Name_____________________ First___________________ 1. A certain compound was found to be 43.64% phosphorous and 56.36% oxygen. a) What is the empirical formula of the compound? 1 P 409 . 1 P/ 409 . 1 smallest by divide P 409 . 1 P g 30.97 P mol 1 P g 3.64 4 = = mol mol mol x 5 . 2 P 409 . 1 O/ 523 . 3 smallest by divide O 523 . 3 O g 16.00 O mol 1 O g 36 . 56 = = mol mol mol x P 1 O 2.5 multiply by two to get whole numbers P 2 O 5 b) Through mass spectrometry, the molar mass of the compound from above was determined to
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Unformatted text preview: be 283.89 g/mol. What is the empirical formula of the compound? P 2 O 5 from part a has a formula mass of 141.94 g/mol 283.89 g/mol 141.94 g/mol = 2 Thus the molar mass is twice the mass of the empirical formula. P 2 O 5 x 2 = P 4 O 10 c) What is the name of the compound with the molecular formula determined in part B tetraphosphorus decaoxide...
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This note was uploaded on 07/10/2011 for the course MATH 251 taught by Professor Astina during the Spring '11 term at Portland State.

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