Question

At certain temperature, the half life period for the thermal decomposition of a gaseous substance depends on the initial partial pressure of the substance as follows

P(mmHg) $t_{1/2}$ in minute

500 235

250 950

Find the order of reaction

[Given log $\left(23.5\right)=1.37$;$log\left(95\right)=1.97$;$log2=0.30]$

• A. 1
• B. 2
• C. 2.5
• D. 3

Answer 1

Answer: (D)

3

$log\frac{t1}{t2}=(1-n)log\frac{c1}{c2}$

$1.37-1.97=(1-n)0.30$

$-0.60=(1-n)0.30$

$1-n=-2$

$n=3$