Lehman College of the City University of New York Department of Chemistry 7) The

Question

Lehman College of the City University of New York Department of Chemistry 7) The number of carbon atoms in 1.5 moles of these cage-like LaCazHzNi20e molecules is a. 6.02x1023 b. 9.03x1023 1.99x1025 d. 33 l molk For questions 8 and 9, consider the reaction of iron (III) bromide with sulfuric acid as shown in the following balanced chemical reaction: 8) When an excess of iron(II) bromide reacts completely with 4 moles of sulfuric acid, how many moles of hydrogen bromide will be formed? a. 16 b. 12 C 8 d. 4 If this reaction described in the previous question runs to completion with a 100% yield, what species will be present in the reaction vessel? 9) a. Fe2(S04)3 & HB b. FeBrs, Fez(SO4)s, & HBr c. H2S04, Fe2(S04)3, &HBr; d. FeBra, H2S04, Fe2(S04)3, & HBr For questions 10 and 11, consider the phase diagram for compound X that is shown below: 10)Imagine you have a bottle of compound X at a pressure of 100 Phase diagrarn for mysterious compound x 70 atm and a temperature of 100 °C. What will happen to compound X if you raise the temperature to 500 °C? a. b. c. d. Compound X will remain a solid Compound X will melt Compound X will evaporate Compound X will sublime 70 60 50 11)At what point on the curve will compound X behave most like an ideal gas? a. Point A b. Point B c Point C 30 20 10 -100 0 100 200 300 400 500 600 700 d. Point D Temperature (degrees Celsius M 114 17 Exam 2

Explanation / Answer

Question 7 was already answered.

From the data, Ferric (III) bromide is in excess, so the limiting reagent will be sulfuric acid.

From the equation, 3 moles of sulfuric acid produces 6 moles of hydrogen bromide.

So, calculate the moles of hydrogen bromide, using the 4 moles of sulfuric acid.

4 mol H2SO4 *(6 mol HBr/ 3 mol H2SO4) = 8 moles HBr

Hence, the correct answer is option c.

So, as per guidelines, 8th question has answered.

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