
Michael C. answered 02/21/17
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ln means log to base e
hence ln(k/0.006104) = 0.001236
taking antilog on both sides
k/(0.006104) = e0.001236
k = 0.006104 * 1.00123 = 0.006112
NB: this is assuming the lower half of your question is correct and gave this top results.