prequiz.key - Dr Zellmer Time 18 mins Chemistry 122 Summer...

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Dr. Zellmer Chemistry 122 Wednesday Time: 18 mins Summer Quarter 2008 June 18, 2008 Pre-quiz Name KEY Rec. Instr. ---------------------------------------------------------------------------------------------------------------------------------------- Show ALL your work to receive full credit. R = 0.08206 L C atm/mol C K = 8.314 J/mol C K 1. (7 pts) The amount of lead, Pb, in the air on a particular day is 2.56 x 10 ! 9 kg/m 3 ? What is this in lb/ft 3 ? (1.000 lb = 453.6 g) (Use dimensional analysis to do the problem .) 2. (8 pts) A quantity of heat equal to 600.0 cal is REMOVED from 40.0 g of water at an initial temperature of 45.0 o C. Calculate the FINAL temperature (in o C). (The specific heat of water is 1.00 cal/g C °C) Show your work . q = m C c C ) T heat (mass) C (sp. heat) C (temp. change) q = - 600.0 cal (heat is removed or released so q is negative; exothermic) Want final temp. so must find ) T first q 600.0 cal ) T = -------- = ----------------------------- = 15.0 °C
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prequiz.key - Dr Zellmer Time 18 mins Chemistry 122 Summer...

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