Please help with my chemistry?

Posted on 2018-04-24 17:56:00 in Chemistry by ALTORN

To correct for the partial pressure of water vapor in a gas collection bottle, the vapor pressure of H2O at the collecting temperature is generally __________. 

subtracted from the atmospheric pressure 

subtracted from the partial pressure of the collected gas 

added to the pressure of the collected gas 

added to the atmospheric pressure 
2. 
A sample of gas at 25°C has a volume of 11 L and exerts a pressure of 660 mm Hg. How many moles of gas are in the sample? 

3.9 mol 

0.39 mol 

87 mol 

9.3 mol 
3. 
A sample of carbon dioxide gas (CO2) has a volume of 2.55 L at a temperature of 13°C and a pressure of 1.66 atm. Calculate the moles of CO2 molecules present in this gas sample. 

0.180 mol 

2.76 mol 

0.360 mol 

0.0902 mol 
4. 
A mass of 0.645 g of an unknown gas is introduced into an evacuated 1.50 L flask. If the pressure in the flask is 0.764 atm at 517 °C, which of the following gases might be in the flask? 

HCl 

NH3 

N2O 

C2H2 
5. 
The average velocity of a gas molecule is __________. 

inversely proportional to the square root of its molar mass (MW) 

inversely proportional to the gas constant, R 

directly proportional to the square of its temperature in °C 

inversely proportional to its kinetic energy 
6. 
Convert 402 K to °C. 

675°C 

129°C 

633°C 

140°C

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