Question 18 provide steps r2 (aq) + 103(aq) Br-(aq)+ 10 (aq) What is the ratio o
ID: 543335 • Letter: Q
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Question 18 provide steps
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
Br2 + IO3- ------------> Br- + IO4-
1. divide the reactio into oxidation half and reduction half reactions
Oxidation half reaction Reduction half reaction
IO3- -------------> IO4- Br2 -------------> Br-
2. Balance all atoms other than O and H atoms.
IO3- -----------> IO4- Br2 --------> 2 Br-
3. To balance oxygen atoms in acidic medium add H2O molecules.
IO3- + H2O ----------> IO4- Br2 -----------> 2 Br-
4. To balance hydrogen atoms in acidic medium add H+ ions.
IO3- + H2O -----------> IO4- + 2 H+ Br2 -----------> 2 Br-
5. To balance charges ad electrons.
IO3- + H2O --------> IO4- + 2 H+ + 2 e Br2 + 2 e ------------> 2 Br-
6. Balance electrons in both half reaction by multiplying with suitable digits.
Do OHR * 1 and RHR * 1
IO3- + H2O --------> IO4- + 2 H+ + 2 e Br2 + 2 e ------------> 2 Br-
7. Add OHR and RHR to get the balanced equation.
IO3- + Br2 + H2O -----------> IO4- + 2 Br- + 2 H+
SO, the coefficients of B2 to IO3- are 1 : 1
(a)
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