At a uniform temperature of

CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance

Problem

300\,\text{K}

, a researcher compresses a gas sample and records the following data. Volume

V

^{3}

): 0.00100 0.00125 0.00150 0.00175 0.00200 Pressure

P

(kPa): 249 199 166 143 125 A separate chemical analysis indicates the accepted amount of gas present should be

n_{\text{accepted}}=0.100\,\text{mol}

. (a) Compute

1/V

for each volume measurement and tabulate your results in units of

\text{m}^{-3}

. (b) On appropriately labeled axes, plot pressure

P

(vertical) versus

1/V

(horizontal) and draw a best-fit straight line. Determine the numerical value of the slope of this line, including units. (c) Using the slope from part (b) and the known temperature, calculate the experimental number of moles

n_{\text{exp}}

in the sample. (d) Determine the percent error between

n_{\text{exp}}

and

n_{\text{accepted}}

. Identify two major experimental factors that could account for any discrepancy you observe.

Related theory

Browse the problem library