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(A) The reaction is $X + Y 	o Z$. Molecularity is defined as the number of reacting species (atoms,ions,or molecules) taking part in an elementary re

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$(i) 	ext{ cannot be defined, } (ii) \, 1$

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(A) The reaction is $X + Y 	o Z$. Molecularity is defined as the number of reacting species (atoms,ions,or molecules) taking part in an elementary reaction,which must collide simultaneously to result in a chemical reaction. Since the mechanism of the reaction is not provided,the molecularity of the overall reaction cannot be defined. The order of a reaction is the sum of the powers of the concentration terms in the rate law expression. Given $	ext{rate} \propto [X]$,the rate law is $	ext{rate} = k[X]^1[Y]^0$. Thus,the order of the reaction is $1$.

$p \ (mm \ Hg)$	$50$	$100$	$200$	$400$
Relative $t_{1/2} \ (s)$	$4$	$2$	$1$	$0.5$

For a reaction $X + Y \to Z$,the rate is given by $\text{rate} \propto [X]$. What are $(i)$ the molecularity and $(ii)$ the order of the reaction?

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