Please help with my chemistry?
Please help with my chemistry?
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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