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Asked Dec 2, 2019
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4.
A sample of gas (1.9 mol) is in a flask at 21 °C and 697 mm Hg. The flask is opened and more gas is added
to the flask. The new pressure is 841 mm Hg and the temperature is now 26 °C. There are
mol of gas in the flask.
now
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4. A sample of gas (1.9 mol) is in a flask at 21 °C and 697 mm Hg. The flask is opened and more gas is added to the flask. The new pressure is 841 mm Hg and the temperature is now 26 °C. There are mol of gas in the flask. now

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Expert Answer

Step 1

Given:

Sample of gas=1.9 mol

Pressure of gas in a flask=697 mm Hg   

Temperature=21oC

New pressure of gas in a flask=841 mm Hg   

New temperature=26oC

Step 2

Conversion:

From Celsius to kelvin:

     Temperature   =21+273=294 K

New temperature=26+273=299 K

Step 3

To calculate mol of gas in the flask:

...

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PV=nRT where P-pressure V=volme n=numberof moles of gas R-ideal gasconstant T-temperature

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