In a study of the rearrangement of ammonium cyanate to urea in aqueous solution

Question

In a study of the rearrangement of ammonium cyanate to urea in aqueous solution at 50 °C NH,NCO(aq)-)(NH2)2C0(aq) the following data were obtained INH4NCO], M1.06 0.530 0.265 0.133 minutes 114 41 793 Hint: It is not necessary to graph these data. The observed half life for this reaction when the starting concentration is 1.06 M is concentration is 0.530 M is min and when the starting min M1 min-1 The average (1/[NH4NCO) / t from t-0 min to t = 114 min is The average (lINH4NC0]) / t from t-114 min to t-341 min is M-1 min-1. Based on these data, the rate constant for this order reaction is M1 min1.

Explanation / Answer

1) The observed half life when the starting concentration is 1.06 M is ______min

When the initial concetration is 1.06M, for it to become half of its concentration 0.53M, it took 114 mins. So the observed half life would be 114 min.

The observed half life when the starting concentration is 0.530 M is ______min

When the initial concetration is 0.530 M, for it to become half of its concentration 0.265 M, it took 341 mins. So the observed half life would be (341 - 114) = 227 min.

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