An ideal gas in a constant-volume gas thermometer (Fig. 13.11) is held at a volume of 0.500 L. As the temperature of the gas is increased by 20.0 °C, the mercury level on the right side of the manometer must rise by 8.00 mm in order to keep the gas volume constant.
(a) What is the slope of a graph of P versus T for this gas (in mm Hg/ °C)?
(b) How many moles of gas are present?

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Open end eas Fixed reference level Flexible tube