Answer the following questions based on the reaction below. Report all answers t

Question

Answer the following questions based on the reaction below. Report all answers to three significant figures. 2AgNO3(aq) + Na2S(aq) Ag2S(s) + 2NaNO3(aq) The concentration of Na2S is 0.473 M at the start of the reaction, and 0.0800 M after 160 seconds. The initial concentrations of the products are zero. 1. What is the average rate of reaction (in M/min) over this time period? Tries 0/3 2. What is the average rate of change (in M/min) of Na2S in the first 160 seconds. Tries 0/3 3. What is the average rate of change (in M/min) of NaNO3 in the first 160 seconds. Tries 0/3 4. What is the concentration (in M) of NaNO3 after 160 seconds.

Explanation / Answer

2AgNO3(aq) + Na2S(aq) Ag2S(s) + 2NaNO3(aq)

rate of reaction = -(1/2)*d[AgNO3]/dt = -d[Na2S]/dt = (1/2)*d[NaNO3]/dt

1) average rate of reaction = change in concentration of Na2S/time interval of the change = (0.473-0.08)/160 = 0.00245 M/s

2) average rate of reaction = 60*0.00245 = 0.1474 M/min

3) rate of change of NaNO3 = 2*rate of reaction = 0.2947 M/min

4) After 160 sec, [NaNO3] = 0.2947*160/60 = 0.786 M

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