5. Conversion of ammonium thiocyanate NH4SCN to thiourea (NH2)2CS is a first-order reversible reaction. Calculate the rate constants of the forward and reverse reactions using the following experimental data:
t, min 0 19 38 48 60 ∞
Percentage of reacted NH4SCN % 2.0 6.9 10.4 12.3 13.6 23.2

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