# What is the sum of all of the stoichiometric

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4.What is the sum of all of the stoichiometric coefficients when the following equation iscorrectly balanced? (Use the smallest possible whole number coefficients. If your equationincludes any coefficients of one, be sure to count those.)FeCr2O7+K2CO3+O2Â®K2CrO4+Fe2O3+CO2(A) 9(B) 15(C) 24(D) 42(E) 31
(5 pts)5. What is the concentration of nitrate ions in a solution labeled as 0.0253 M Fe(NO3)3?(A) 0.0253 M(B) 0.0759 M(C) 0.0506 M(D) 0.00843 M(E) None of those(5 pts)6.What volume of 0.109 M HNO3is required to dissolve 2.50 g of solid Ba(OH)2?Ba(OH)2(s) + 2 HNO3(aq)Â®2 H2O(!) + Ba(NO3)2(aq)
NAME:_________________________________(5 pts)7.Diborane (B2H6) can be produced by the following reaction.3 NaBH4(s) + 4 BF3(g)Â®2 B2H6(g) + 3 NaBF4(s)Which of the following reactant mixtures could produce the greatest amount of diborane? (Assumethat the reaction goes to completion with 100% yield.)
Â© 2018 L.S. BrownA3
(6 pts)8.A sample of N2gas occupies a volume of 1.25 L at 45.0Â°C and 0.975 atm. The temperatureand the pressure of the gas are both changed, and as a result the gas expands to a finalvolume of 2.75 L. Find the density of the gas at the end of this process.
(5 pts)9.Ultraviolet light with a frequency of 1.62Â´1015sâ€“1strikes a tungsten metal surface andelectrons with a kinetic energy of 7.20Â´10â€“19J are emitted. What is the electron bindingenergy for tungsten?(A) 7.20Â´10â€“19J(B) 3.11Â´10â€“19J(C) 4.41Â´10â€“19J(D) 3.53Â´10â€“19J(E) 6.81Â´10â€“19J
Consider the two possible Lewis structures shown below in answering Questions 10 â€“ 14. Inanswering the following questions, be sure to consider any additional resonance structures.(3 pts)10.Which of these structures would represent an ion?(3 pts)
A4Â© 2018 L.S. Brown

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Chemical reaction, Rate equation, Dr Larry Brown