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When looking at a graph how do you know if it is zero order, first order,...

When looking at a graph how do you know if it is zero order, first order, second order. Would I be right to assume that if the y axis, would be In HOF for first order, HOF for zero order, and 1/HOF for second order. Would the equation y = mx+b change. For example y = -0.17x-0.61 change? What would be an example of the equation for zero, first and second order?

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Answer #1

For a zero order reaction, the graph of [HOF] vs t will be a straight line with negative slope.

The equation will be [HOF] = [HOF]0 - kt

For first order reaction, the graph of log [HOF] vs t (or ln [HOF] vs t) will be straight line with negative slope.

The equation will be ln [HOF] = ln [HOF]0 - kt or log [HOF] = log [HOF]0 - kt/2.303

For second order reaction, the plot of 1/ [HOF] vs t will be a straight line with positive slope.

The equation will be 1/[HOF] = kt + 1/[HOF]0

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