Where.. <span>[At] = concentration of component "A" after time = t has elapsed </span> <span>k = rate constant </span> <span>t = time elapsed </span> <span>[Ao] = concentration at time = 0.. i.e.. the concentration you started with. </span>
<span>************ </span> <span>now... you have pressure.. not concentration right? </span>
<span>if your gas is an ideal gas, then </span> <span>PV = nRT </span> <span>P = (n/V) x (RT) </span>
<span>and since "concentration" = moles / volume.. i.e.. [A] = n/v </span> <span>and since "R" is a constant </span> <span>and since "T" is a constant </span>
<span>[A] = P / (RT) </span>
<span>***** </span> <span>so we can either do this.. </span> <span>ln( Pt/(RT) ) = -kt + ln( Po/(RT)) </span>
<span>and since Pt and "t" vary and Po and R and T are constant </span>
<span>this is of the form </span> <span>y = mx + b </span>
<span>if we let </span> <span>.. y = ln( Pt / (RT) ) </span> <span>.. m = -k </span> <span>.. .x = time </span> <span>.. b = ln( Po / (RT)) </span>
<span>i.e.. a plot of ln(P / RT) on the y-axis versus time on the x-axis will have a slope = -k </span>
<span>so.. </span> <span>open up an excel spreadsheet </span> <span>make three columns starting with T = </span>
<span>mouse to A2 </span> <span>left click and hold </span> <span>drag highlight to A7 </span> <span>press and hold ctrl </span> <span>release mouse (keep holding ctrl </span> <span>mouse to c2 </span> <span>left click and hold </span> <span>drag to c7 </span> <span>release ctrl </span> <span>release mouse </span> <span>left click insert </span> <span>left click scatter </span> <span>choose the upper left one with just the data points by left clicking on it </span> <span>right click on any data point on the plot </span> <span>left click add trendline </span> <span>left click the two boxes to display equation on chart and display r^2 </span> <span>close </span> <span>right click on the equation that appeared on the plot </span> <span>left click format trendline label </span> <span>sent number format to display 8 decimal points </span>
<span>and... TADA.. you have.. </span> <span>(1).. plotted ln(P/RT) vs time </span> <span>(2).. fitted the data points with the equation y = -0.00020775x - 4.0986 </span>
Through the process of cellular respiration, the energy in food is converted into energy that can be used by the body's cells. During cellular respiration, glucose and oxygen are converted into carbon dioxide and water, and the energy is transferred to ATP.
