Quiz+5+Answer+Key - 2 SO 4(1000mL/1 L = 340 mL Quiz#5 Chem...

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Quiz #5 Chem 130 Sec 208 GSI: Andrea Geyer Please show all work or no credit will be given Name:______________________ 1) What is the limiting reagent when 2 g H 2 and 1 g O 2 are used for the following: 2H 2 + O 2 → 2H 2 O 2 g H 2 * (1 mol H 2 / 2.008 g H 2 ) * (2 mol H 2 O / 2 mol H 2 ) = 0.996 mol H 2 O 1 g O 2 * (1 mol O 2 / 32.0 g O 2 ) * (2 mol H 2 O / 1 mol O 2 ) = 0.0625 mol O 2 So O 2 is limiting. 2) Fe 2+ + Cr 4+ Fe 4+ + Cr + a) Write balance half reactions Oxidation: 3Fe 2+ → 3Fe 4+ + 6e- Reduction: 2Cr 4+ + 6e- → 2Cr + b) Identify the oxidizing agent Cr 4+ 3) How many milliliters do you need of a 0.15 M solution H 2 SO 4 to have 5.0 g H 2 SO 4 ? 5 g H 2 SO 4 * (1 mol H 2 SO 4 / 98.078 g H 2 SO 4 ) * (1 L / 0.15 mol H
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Unformatted text preview: 2 SO 4 ) * (1000mL /1 L) = 340 mL Quiz #5 Chem 130 Sec 109 GSI: Andrea Geyer Please show all work or no credit will be given Name:______________________ 1) What is the mass percentage of carbon in W(CO) 6 ? 6 mols C * (12.011 g C / 1 mol C)= 72.066 g C 72.066 g C / (183.84 g + 6* 12.011 g + 6* 15.999 g) *100 = 26.5% 2) Mn 2+ + Cr 4+ → Mn 4+ + Cr + a) Write balance half reactions Oxidation: 3Mn 2+ → 3Mn 4+ + 6e-Reduction: 2Cr 4+ + 6e- → 2Cr + b) Identify the oxidizing agent Cr 4+ 3) Assign oxidation states to Na, Cr, and O in Na 2 Cr 2 O 7 . Na + Cr +6 O-2...
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