CHEM

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Quiz #6 Chem 130 Sec 208 GSI: Andrea Geyer Please show all work or no credit will be given Name:______________________ 1) Solid sodium chlorate decomposes to produce solid sodium chloride and oxygen gas according to the equation below. What volume of oxygen gas, measured at 40 ° C and 1.3 atm, will be produced when 13.5 g of sodium chlorate is decomposed? 2NaClO 3(s) 2NaCl (s) + 3O 2(g) 13.5 g NaClO 3 * (1 mol NaClO 3 / 106.436 g NaClO 3 ) * (3 mol O 2 / 2 mol NaClO 3 ) = 0.190 mol O 2 PV = nRT P = 1.3 atm n = 0.190 mol R= 0.08206 atm*L / mol *K T = 273 K + 40 = 313 Thus V = 3.76 L 2) A graduate student was running a reaction composed of 3 different gases each contributing the same volume of gas at 273 K and 1 atm. The three gases were Xe, H 2 , and Ar. Which one of these gases contributes the greatest number of moles to the reaction? All contribute the same number of moles because all contribute that same number of mL at STP and 1 mol = 22.4 L. 3) A little kid is found inhaling helium from a 1.2 L ballon and is feeling light- headed.

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• Fall '07
• Chemistry, Chem, mol, Andrea Geyer

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