Quiz 6 Name: _______________________________________ Chemistry 102, Lecture 401 – Fall 2015 DS Section: (1 point) ____________________________ 1. Hydrogen ( ) and nitrogen ( ) combine to form gaseous ammonia. (2 points) N2(g) + 3H2(g) → 2NH3(g) I II III a. Which reaction vessel would yield the highest theoretical yield? I b. In which reaction vessel(s) is/are hydrogen the limiting reactant? I and III 2. What is mass (in g) of iron(III) nitrate is needed to produce 10.0 g molar mass / g∙mol−1 experimentally of iron(III) carbonate if the percent yield for the Fe2(CO3)3 291.73 reaction is 82.5%? Sodium carbonate is in excess. (3 points) Fe(NO3)3 241.88 2Fe(NO3)3(aq) + 3Na2CO3(aq) → Fe2(CO3)3(s) + 6NaNO3(aq) (10.0 g Fe ( CO )
2
3 3
⎛ 100.0 g Fe2 ( CO3 )3 theo ⎞⎛ mol Fe2 ( CO3 )3 ⎞⎛ 2 mol Fe (NO3 )3 ⎞⎛ 241.88 g Fe (NO3 )3 ⎞
exp ) ⎜
⎟⎟ = 20.1 g Fe (NO3 )3
⎜ 82.5 g Fe2 ( CO3 ) exp ⎟⎜
⎟⎜ 291.73 g Fe2 ( CO3 ) ⎟⎜
⎟⎜ 1 mol Fe2 ( CO3 ) ⎟⎜
⎟⎜ mol Fe (NO3 )
3
3 ⎠⎝
3 ⎠⎝
3
⎝
⎠⎝
⎠
3. From the list of compounds to the right, what is one compound that will react to form a precipitate with sodium hydroxide, NaOH? (4 points) FeSO4, Al(NO3)3 Al(NO3)3 Ba(HCO3)2 PbCl2 K2CO3 FeSO4 HCl a. Give the balanced equations as noted: Molecular equation: 3NaOH(aq) + Al(NO3)3(aq) → Al(OH)3(s) + 3NaNO3(aq) Total equation ionic: 3Na+(aq) + 3OH−(aq) + Al3+(aq) + 3NO3−(aq) → Al(OH)3(s) + 3Na+(aq) + 3NO3−(aq) Net equation ionic: Al3+(aq) + 3OH−(aq) → Al(OH)3(s) Spectator ion(s): Na+/NO3− 4. What species are present in a solution of the weak acid, HClO2, in water? (2 points) HClO2, H+, ClO2− a. What is the balanced net ionic equation of this acid with the strong base sodium hydroxide? HClO2(aq) + OH−(aq) → H2O(l) + ClO2−(aq)