For a first order reaction, the ratio of the time for 75% completion of a reaction to the time for 50% completion is________. (Integer answer)

<p><span contenteditable="false"> <math> <mrow> <mi>Δ</mi> <mi>H</mi> <mo>=</mo> <msub> <mrow> <mrow> <mo> (</mo> <mrow> <msub> <mrow> <mi>E</mi> </mrow> <mrow> <mi>a</mi> <mi>c</mi> <mi>t</mi> </mrow> </msub> </mrow> <mo>)</mo> </mrow> </mrow> <mrow> <mi>f</mi> </mrow> </msub> <mo>−</mo> <msub> <mrow> <mrow> <mo> (</mo> <mrow> <msub> <mrow> <mi>E</mi> </mrow> <mrow> <mi>a</mi> <mi>c</mi> <mi>t</mi> </mrow> </msub> </mrow> <mo>)</mo> </mrow> </mrow> <mrow> <mi>b</mi> </mrow> </msub> </mrow> </math> </span></p><p>= x – (x + y) = -y</p><p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; = -45 KJ/mol</p><p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ans. = 45</p>

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