When the pressure, temperature, and volume of a gas are known, the ideal gas law can be used to calculate
molar amount
Avagodro's number
diffusion rates
the distance from the Earth to the moon
A sample of helium diffused 4.57 times faster than an unknown gas diffuses. What is the molar mass of the unknown gas? (atomic mass of He is 4.00)
12 g/mol
18.2 g/mol
38.8 g/mol
83.6 g/mol
What is the volume occupied by 2.00 moles of hydrogen gas at 300 K and 1.25 atm?
39.4 L
5.60 L
14.9 L
3.81 L
22.4 liters is the
standard molar volume of a gas at STP
molar volume of a gas, regardless of temperature and pressure
the gas constant
not applicable to gases at STP
The coefficients in a balanced equation represent
the volume ratio for gases only
the volume ratio for all substances, regardless of what state (solid, liquid, gas)
the mass ratio for gases only
the mass ratio of all substances, regardless of what state (solid, liquid, gas)
2HCl(g) yields H2(g) + Cl2(g) in a decomposition reaction. How many grams of HCl must be used to produce 10 L of chlorine at STP? (mw of HCl is 36.5g/mol)
32.6 g
15.8 g
30.2 g
36.5 g
How many times faster will hydrogen gas diffuse thans nitrogen gas, at the same temperature and pressure? (mw of hydrogen is 1 g/mol; mw of nitrogen is 14 g/mol)
3.72 times faster
1.37 times faster
2.15 times faster
4.24 times faster
If chlorine gas (mw 35.5 g/mol) and bromine gas (ms 80 g/mol) were injected into opposite ends of a long tube at the same time and allowed to diffuse toward the center, where would they meet?
closer to the end that held the bromine gas
closer to the end that held the chlorine gas
exactly in the middle
at 2:05 outside the school
C(s) + 2H2(g) yields CH4(g). How many volumes of hydrogen are needed to produce 20 liters of methane (CH4)?
2.0
20
22.4
40
A sample of helium effuses through a porous container 6.50 times faster than does unknown gas X. What is the molar mass of the unknown gas? (mw of helium 4 g/mol)
169 g/mol
56.0 g/mol
68.8 g/mol
118 g/mol
What is the molar mass of a gas with a mass of 0.650 g occupying 1.12 L at 280 K and 1.14 atm?
11.7 g/mol
13.5 g/mol
39.8 g/mol
15.3 g/mol
H2(g) + Cl2(g) yields 2HCl(g) . In this reaction, what is the volume ratio of H2(g) to HCl(g)?
1 : 1
1 : 2
2 : 1
2 : 2
What is the process in which gas molecules randomly mix and eventually reach the same concentration throughout their container?
diffusion
effusion
confusion
protrusion
According to Avagadro's law, which of the following contain equal numbers of molecules?
1 L of H2(g) and 1 L of O2(g) at the same temperature and pressure
1 L of H2(g) and 1 L of O2(g) regardless of thetemperature and pressure
1 gram of H2(g) and 1 gram of O2(g) at the same temperature and pressure
1 L of H2(g) and 16 L of O2(g) at the same temperature and pressure
At a certain temperature and pressure, chlorine molecules have a velocity of 0.0380 m/s. What is the velocity of sulfur dioxide molecules under the same conditions?
0.0400 m/s
0.0380 m/s
0.4870 m/s
0.1860 m/s
The density of a gas is 3.07 g/L at STP. Calculate the gas's molar mass.
68.8 g/mol
35.8 g/mol
83.9 /mol
1.26 g/mol
Of volume, mass, and density, which are affected by changes in pressure and temperature?
only volume
only volume and density
only volume and mass
volume, mass, and density
Which gas will diffuse faster, oxygen, carbon dioxide, or nitrogen?
nitrogen
carbon dioxide
oxygen
none--they will all diffuse at the same rate, since one mole of any gas has the same volume