Question

The density of air at 25.00C, and 1.00 atm is 1.224 g/L. What is the average molecular weight of air?

Answer #1

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A 1.85−L vessel contains 4.60 g of a gas at 1.00 atm and 27.0°C.
(a) Calculate the density of the gas in g/L. (b) What is the molar
mass of the gas?

2.55 g of an unknown gas at 43 °C and 1.00 atm is stored in a
2.25-L flask.
What is the density of the gas?
What is the molar mass of the gas?

What volume of air contains 10.0 g of oxygen gas at 273 K and
1.00 atm?

Liquid Halothane has a density of 1.87 g/mL, and boils at 50.2
degrees celsius and 1.00 atm.
A) If Halothane behaved as an ideal gas, what volume would 10.0
mL of Halothane occupy at 60 degrees celsius and 1.00 atm of
pressure? (In Liters)
B) What is the density in g/L of Halothane vapor at 55 degrees
celsius and 1.00 atm of pressure?

In a closed 1.00 L flask, 3.20 atm of CO reacts with 1.20 atm of
O2 according to the equation below. Assuming that the temperature
remains constant, what is the final pressure in the flask?
2 CO(g) + O2(g) ? 2 CO2(g)
A.4.60 atm B. 1.20 atm C. 1.60 atm D. 3.20 atm

At 28°C and 0.982 atm, gaseous compound HA has a density of 1.16
g/L. A quantity of 3.34 g of this compound is dissolved in water
and diluted to exactly 1 L. If the pH of the solution is 5.01 (due
to the ionization of HA) at 25°C, calculate the Ka of the acid.
Please explain your steps.

A flask is charged with 1.500 atm
N2O4(g) and 1.00 atm
NO2(g) at 25 °C and the following equilibrium
is achieved:
N2O4(g)<------->
2NO2(g)
After equilibrium is reached, the partial pressure of NO2 is
0.512 atm. What is the equilibrium partial pressure of N2O4?

If the molecular weight of air is 28.9, what is the density of
air at atmospheric pressure and a temperature of 368.7 K? 1 atm =
1.013×105 N/m2, the mass of a proton is 1.67262 × 10?27 kg ,
Avogadro’s number is 6.02214 × 1023 mol?1 and k = 1.38065 × 10?23 N
· m/K . Answer in units of kg/m3.

(a) Air contains 5.2 ppmV of Helium at STP (25o C and 1 atm).
Determine the concentration of Helium in ug/L at same condition.
(Mw of Helium=2)
(b) EPA limits (maximum allowable) benzene (C6H6) concentration
in gasoline to 1.3% by weight. If both Benzene and Gasoline has a
density of 0.84 g/mL, what is maximum allowable concentration of
Benzene in ppmM.

At 0.483 atm and 52 degress C, the density of gas "X" is 2.35
g/L. A volume of 45.0 mL of gas "X" effuses through an apparatus in
3.60 seconds. The rate of effusion of gas "Y" through the same
apparatus and under the same conditions is 18.4 mL/sec. What is the
molar mass of gas "Y"?

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