282.3 kJ A system in Only a change in equilibrium will affect the 11. Which stat

Question

282.3 kJ A system in Only a change in equilibrium will affect the 11. Which statement best represents LeChatelier's Principle? 25(2-2 des) a. When a change is made to a system in equilibrium, equilibrium can never d. A system in equilibrium will always remain in equilibrium. of a be system in equilibrium will respond to a change by moving in the direction that redaces the change as it returns to equilibrium 12. Balance the following equation (in acidic solution) What is the coefficient of H,S7 b. 3 d.) 1 The half-life of the reaction A B is 0.560 minutes, and the rate-law expression has the form: rate-k.lf the initial concentration of A is 3.40 M, what is the rate constant? a. 0.357 mol/L·min b. 1.25 moVL min 13. 6.07 mol/L·min 1.79 mol/L·min 3.04 mol/L·min d. 14. A 30.0 mL sample of a NaCIO, solution reacts with 40.0 ml of a 0.149 M solution of I, What is the molarity a. 0.331 M b. 0.249 AM c. 2.00 M d. 2.67×10-2M 3 H203HIO, 5.53 × 10-1 M 15. Calculate the standard cell potential for the cell: AglAg'(1 M)Mg(1 M)Mg b. 1.57 V d. 1.25 V 3.17V

Explanation / Answer

Balance equation

5NaClO3 + 3H2O + 3I2 = 6HIO3 + 5NaCl

now, relate:

mol of I2 = MV = 0.149*40 = 5.96

ratio is 5 mol of NaClO3 = 3 mol of I2

x mol of NaClO3 = 5.96 mol of I2

x = 5.96*5/3 = 9.933 mmol

V = 30 mL

[NaClO3] = mmol/mL = 9.933/30 = 0.3311M

nearest is A

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