key to homework 15 - Homework 15 (from material in chapters...

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Unformatted text preview: Homework 15 (from material in chapters 9 and 10 of the text) i ' Due: Monday, April 14, 2008 1. Based on their MO diagrams, fill in the following table for the indicated species. afia Jere! * If stable, ' ' d“ W3 number of number of bond stable or etic M O " 7' eleo valence e’s m unstable ' ' Stable means stable in comparison to the species it would logically form on brea 'ng up. For 2+ 2+ example, NO —r N + O. 2. In working this problem, assume H2 gas behaves ideally and pay attention to significant figures. In Chemistry 109 lab, hydrogen gas is produced by reacting an active metal such as magnesium with a strong acid such as nitric acid. Suppose that one mixed 5.00 grams of magnesium solid with 400 mL of 1.12 M aqueous nitric acid, thus producing hydrogen gas and aqueous magnesium nitrate. The hydrogen gas was then collected over water at a temperature of 23.0" C and at a pressure equal to atmospheric pressure. On the day of the experiment, the barometric pressure was 744.33 torr. (A) Write a balanced equation for the reaction, showing the physical state of each reactant and product (sol, liq, gas, or aq). (B) Determine the limiting reagent and calculate how many moles of gas should be produced. (C) Using the table of water vapor pressures given below, calculate the pressure of the hydrogen gas in atm. (D) Calculate the mole fraction of water in the gaseous mixture that was collected. (E) Calculate the volume of H2 gas in liters that should have been collected. (F) Calculate the percent error in the calculated volume if one does not correct for water vapor pressure. Given: 1 atrn = 760.000 torr, T(in K) = T(in °C) + 273.15. 19.827 20.070 20.316 20.565 20.815 21.068 21.324 21.583 21.845 22.110 3. In working this problem, assume gases behave ideally and pay attention to significant figures. Assume that the reduction of benzene gas in a hydrogen atmosphere to produce cyclohexane gas is run in a dry, 1.000 liter, constant-volume reaction vessel at 100.0°C. C6H6 (gas) + 3H2(gas) 9 C6H12(gas)- If 15.6 grams of benzene and 0.600 moles of hydrogen were placed in the reaction vessel, what will be: (G) the pressure in the vessel before reaction occurs, (H) the mole fraction of H2 in the vessel before the reaction occurs, (1) the limiting reagent, (J) the pressure in the vessel after the reaction is complete. (K) the mole fraction of H2 in the vessel after the reaction is complete. ‘ @ (so!) i“ Z beg/(J3 -9 Hzécsj-f— M3CUo3) 6?), CB) flrcWX = 347,“. 44W”) sum ,Ua—o/v-J- M AM 71mm, (646(3“) 7" fit/25”) ‘9 Q’s/Ia 9‘s}, a = +a’aoMA/éoOXZOéfi 37g'2'g (Locum ‘ =(2a‘7l75'5th ...
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key to homework 15 - Homework 15 (from material in chapters...

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