Question

8]] a) the number of moles of O2 in 56.4 L of O2 gas

b) the volume, in liters, occupied by 0.170 mole of He gas

1.24 If the partial pressures are oxygen 440 torr and helium 40 torr , what is the partial pressure (torr) of the nitrogen in the mixture?

1.25 . If the partial pressure of oxygen drops below 110 mmHg , passengers become drowsy. If this happens, oxygen masks are released. What is the total cabin pressure at which oxygen masks are dropped?

Answer #1

Since there is no information about Temperature and Pressure, it is assumed that O2 and He are at STP.

At STP, P = 1 atm , T = 273 K

8) a) It is assumed that O2 gas is at STP

At STP,

P = 1 atm

T = 273 K

Given that Volume of O2 gas V = 56.4 L

number of moles of O2 gas , n = ?

Ideal gas equation is

PV = nRT R = universal gas constant = 0.0821 L.atm/K/mol

n = PV/RT

= 1 atm x 56.4 L / ( 0.0821 L.atm/K/mol x 273 K)

= 2.52 moles

Therefore,

number of moles of O2 in 56.4 L of O2 gas = 2.52 moles

b)

It is assumed that He gas is at STP.

At STP,

P = 1 atm

T = 273 K

Given that number of moles of He gas, n = 0.17 moles

volume of He gas, V = ?

Ideal gas equation is

PV = nRT R = universal gas constant = 0.0821 L.atm/K/mol

V = nRT/P

= 0.17 moles x 0.0821 L.atm/K/mol x 273 K / 1 atm

= 3.81 L

Therefore,

volume occupied by 0.170 mole of He gas = 3.81 L

A mixture of helium, nitrogen, and oxygen has a total pressure
of 759 mmHg . The partial pressures of helium and nitrogen are 233
mmHg and 200 mmHg , respectively.
1. What is the partial pressure of oxygen in the mixture? PO2 =
______ mmHg
2. What volume of O2 at 988 mmHg and 21 ∘C is required to
synthesize 19.0 mol of NO?
Express your answer to three significant figures and include the
appropriate units. volume of O2 =...

A gas mixture containing O2 N2 and He exerts a total pressure of
1256 torr. If the partial pressures are 555 torr for O2 and 143
torr for He, what is the partial pressure in atm of the nitrogen in
the mixture?

1. A gas mixture containing oxygen, nitrogen, and helium exerts
a total pressure of 950 torr . If the partial pressures are oxygen
425 torr and helium 40 torr , what is the partial pressure (torr)
of the nitrogen in the mixture?
2. When a person who cannot breathe properly is placed on a
ventilator, an air mixture is delivered at pressures that are
alternately above the air pressure in the person's lung, and then
below. How will this move...

Exercise 11.76
A mixture of helium, nitrogen, and oxygen has a total pressure
of 755 mmHg . The partial pressures of helium and nitrogen are 241
mmHg and 194 mmHg , respectively.
Part A
What is the partial pressure of oxygen in the mixture?
Part B
The hydrogen gas formed in a chemical reaction is collected over
water at 30 ∘C at a total pressure of 730 mmHg .
What is the partial pressure of the hydrogen gas collected in...

In a gas mixture, the partial pressures are argon 455 mmHg ,
neon 90 mmHg , and nitrogen 125 mmHg .
Part A
What is the total pressure (atm) exerted by the gas mixture?
--------------------------------------------------------------------------------------------------------------------------------------------
Part B
What is the volume, in liters, of 4.00 moles of methane gas,
CH4, at 11 ∘C and 1.60 atm?
Express your answer with the appropriate units.
---------------------------------------------------------------------------------------------------------------------------------------------
A 0.211 g sample of carbon dioxide, CO2, has a volume of 549 mL
and a...

1. How many moles of gas must be forced into a 4.8 L tire to
give it a gauge pressure of 32.4 psi at 30 ∘C? The gauge pressure
is relative to atmospheric pressure. Assume that atmospheric
pressure is 14.5 psi so that the total pressure in the tire is 46.9
psi . Express your answer using two significant figures. n = _____
mol
*** different kind of question***
2. What volume of O2 at 988 mmHg and 21 ∘C...

1. A sample of gas with an initial volume of 28.2 L at a
pressure of 728 mmHg and a temperature of 301 K is compressed to a
volume of 14.9 L and warmed to a temperature of 375 K. What is the
final pressure of the gas?
2. A gas sample with a volume of 5.3 L has a pressure of 725
mmHg at 24C. What is the pressure of the sample if the volume
remains at 5.3 L...

Two gases are mixed in a 10.0 L fixed volume flask: 8.0 L of
O2 at 2.00 atm and 2.0 L of N2 at 3.00
atm.
A.) Calculate the partial pressure for each gas and the total
pressure.
B) How much (volume in liters) argon at 5.0 atm must be added to
the 10.0 L flask to lower the mole fraction of oxygen to ½ (i.e.,
to get χO2 = 0.5)? Hint – maybe it’s easier to do
part C...

37)Into a 15.00-liter container at 25°C are placed 1.00 moles of
O2 gas and 3.00 moles of solid C (graphite). If the carbon and
oxygen react completely to form CO(g), what will be the final
pressure in the container at 25°C? a) 0.274 atm b) 1.00 atm c) 4.89
atm d) 1.63 atm e) 3.26 atm
39) N2 (g) + 3H2 (g) 2NH3 (g). If a 3.4 L flask is first
charged with 1.2 atm of nitrogen, then hydrogen is...

A weather balloon contains 222 L of He gas at 20. °C and 760.
mmHg. What is the volume of the balloon when it ascends to an
altitude where the temperature is -40. °C and 540. mmHg?
1
What volume does 12.5 g of Ar gas at a pressure of 1.05 atm and
a temperature of 322 K occupy? Would the volume be different if the
sample were 12.5 g of He gas under the same conditions?
How many moles...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 3 minutes ago

asked 5 minutes ago

asked 9 minutes ago

asked 13 minutes ago

asked 17 minutes ago

asked 22 minutes ago

asked 22 minutes ago

asked 23 minutes ago

asked 26 minutes ago

asked 26 minutes ago

asked 30 minutes ago

asked 34 minutes ago