quiz 7 - BIOL 1510 Quiz 7 Your Name :_ T.A. Name: _ Lab...

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BIOL 1510 Quiz 7 Your Name :___________________________ T.A. Name: ___________________________ Lab section: ___________________________ This quiz should take no more than 15 minutes. Clearly mark your answers on this answer sheet. Ambiguous and vague answers will NOT be counted as correct. 1) ( 3.5 points ) A common fertilizer used by farmers is ammonium chloride (molecular weight = 53 g/mol). A large fertilizer spill causes a 50 mg/L concentration of ammonium chloride in a nearby pond. The maximum concentration for the pond to sustain life is 4 x 10 -4 M of ammonium chloride. If the pond is 1 million liters in volume, what volume of water in liters must be added to sustain life in the pond, to 2 significant figures? (Show all work) Answer: 1,357,500 liters. M x mg g g mol liter mg 4 10 43 . 9 1000 53 50 - = (DELETE) ( 29 ( 29 ) )( 10 4 ( 000 , 000 , 1 10 43 . 9 4 4 f V M x L M x - - = (DELETE) V f = 2,357,500 liters V added = V f – V i = 1,357,500 liters
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quiz 7 - BIOL 1510 Quiz 7 Your Name :_ T.A. Name: _ Lab...

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