Determining the Ideal Gas Constant

In this experiment, a scientist measures the total pressure of gas created when a metal bicarbonate or carbonate is completely decomposed in a fixed volume container at high temperature. The following data were obtained.

  1. Write balanced equations for all of the decomposition reactions including the phase for each of the compounds under the experimental conditions. You can assume that the solid product is the corresponding metal oxide.
  2. The Ideal Gas Equation is PV = nRT. To obtain the Gas Constant R, you will plot a graph of P*V (y-axis) against n*T(x-axis) for these data. a. Create a spreadsheet page, starting with the original data of Table 1, and include appropriately transformed data for pressure, volume, moles of gas (n), temperature, and values of P*V and n*T. This spreadsheet must include headings for each column (including units) and at the bottom of each column put the formula used; for example (C2 x B2/100). b. Use the P*V and n*T values to create a single graph of all this data. Plot each separate metal salt dataset using a different symbol. c. Determine if there are any outliers in the data. If so, identify them in your spreadsheet and remove them from the plot. Then determine the Gas Constant R by fitting a single trendline to all the remaining data. For the Trendline option check Y-intercept to 0.0, and display the equation and R2 value on the chart.
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