15 Solved Problems on Introduction to Chemistry - Exam 6 | CHEM 100, Exams of Chemistry

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Summer 07 Chem 100 Ch 8.6-9 100 Pts Name ie For Full Credit, show all of your work work Hints: 1 atm = 760 mmHg, 1 mmHg = 1 torr, study hard Part 1: Choose the Single closest or best answer. 5 pts each 1. How many mélesof gas are present in a 10.0 liter sample at STP? & E A) 224 moles 2 be . GR mf B) 22.4 moles C) 10.0 moles (oO ZX Yo sabe ref in i D) 2.24 moles > ee, = & E)).446 moles How many grams of 02 are contained in a 25.0 L sample at 5.2 atm and 28.0°C? A) 1810 g 3 . ass? Ree ea Sat ee thera E) 0.164 g , i RT (,0a?6 ll 50/) ji Lire | — S26 a) Ont 2 te % Calculate the volume of 5.00 mol of helium (m.w. 4 g/mol) at 120°C and 1520 mm Hg. A) 323 liters 80.7 liters {J Sel fe Fe C) 0.106 liters D) 0.0324 liters ” ao (odie K d 7226 NC ni >)) E) none of the above 7% oe ee een 2 68 What is the total pressure of a mixture of He (m.w. 4 g/mol) and H2 (m.w. 2 g/mol) if the partial pressures are 320 mm Hg and 800 mm Hg respectively? A) 40 mm Hg B) 60 mm Hg C) 320 mm Hg D) 480 mm Hg () 1120 mm Hg