<p>Observe the given below Chemical Reaction.</p>

<p><img alt="" src="https://school.achievam.com/upload/questionbank/question/que_1759047036.jpg" style="height:120px; width:431px" /></p>

<p>(a) Explain what a rate law expression represents in terms of concentration dependence.</p>

<p>(b)&nbsp;What is the order of reaction?</p>

<p>(c) Calculate the value of rate constant, when concentration of HI is 0.1 mol/ litre.</p>