r2 (aq) + 103(aq) Br-(aq)+ 10 (aq) What is the ratio of coefficients for Br2 to
ID: 543304 • Letter: R
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r2 (aq) + 103(aq) Br-(aq)+ 10 (aq) What is the ratio of coefficients for Br2 to IO3 in the balanced net ionic reaction? B. 2:1 C. 1:2 D. 2:3 E. 3:2 exposed to the atmosphere, where the prevailing pressure is 745 torr. The mercury level in the open arm is 50. mm below that in the arm connected to the flask of neon. What is the neon 4. A flask containing neon gas is connected to an open-ended mercurym pressure, in torr? A. -50. torr B. 50. torr C. 695 torr D. 710 torr E. 795 torr Exam 2, CHE 131 Fall 2016, Version A, Page 4 of 8 16. A 0.850-mole sample 20.46 L at 123 C and A. 5.38L B. 10.9L C. 19.0L D. 38.3 L 17. A student adds 0.161 be 736 torr at 300Explanation / Answer
Ratio of coefficient will be 2:3 .i.e. D
as IO3- + Br- --> Br2 + IBr
I in IO3- = 5+ becomes 1+, reduced gained 4 electrons
Br- = 1- becomes neutral, oxidized, lost 1
Anwer 14 Neon pressure will be D.i.e. 710 torr
As mercury level in open arm = 50mm Hg or 50 torr (1mm Hg = 1.0000001500123 torr)
Therefore , 760 mm Hg - 50m Hg = 710 mm Hg or 710 torr (1mm Hg = 1.0000001500123 torr)
Standard mm Hg pressure = 760 mm Hg from literature
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