Question

0.175 g of a gas occupies 242.0 mL at STP. What is its molecular weight?

Answer #1

WE will assume here that the gas is ideal.

For ideal gas the realtion between pressure temperature and moles and volume is

PV = nRT

P = Pressure (Given STP ) = 1 atmosphere

n = moles = Mass / Molecular weight = 0.175 / Molecular weight

V = Volume = 242 mL = 0.242 L

T = Temperature = 273.15 Kelvin (STP)

R = gas constant = 0.0821 L atm / K mole

Putting all the values

1 X 0.242 = 0.175 X 0.0821 X 273.15 / Molecular weight

So molecular weight = 0.175 X 0.0821 X 273.15 / 0.242 = 16.21 g / moles

The possibility is that the gas is oxygen.

A sample of gas occupies 500.mL of STP. what volume
will the gas occupy at 85.0 degrees Celsius and 525 torr?

1. What is the molar mass of a gas if 0.252 g of the gas
occupies a volume of 125 mL at a temperature of 123°C and a
pressure of 778 torr?
2. A mixture of 0.229 g of H2, 1.08 g of
N2, and 0.836 g of Ar is stored in a closed container at
STP. Find the volume (in L) of the container, assuming that the
gases exhibit ideal behavior.

5. An ideal gas occupies a volume of 7.0 L at STP. What is its
gauge pressure (in kPa) if the volume is halved and the absolute
temperature is doubled? Show working equation with answer. Answer
must be in kPa.

A)
A sample of a gas weighs 2.760 g and has a volume of 940 mL at
749 torr and 33°C. What is its molar mass?
___________ g/mol
B)
A sample of argon gas at STP occupies 14.9 L. What mass of argon
is present in the container?
_______ g

A 0.02882 g sample of gas occupies 10.0-mL at 288.5 K and 1.10
atm. Upon further analysis, the compound is found to be 38.734% C
and 61.266% F. What is the molecular formula of the compound?
What is the molecular formula of the compound?
Draw the Lewis structure for this compound
Is this bond polar?
Identify the geometry around each carbon atom.

A 0.04358 g sample of gas occupies 10.0-mL at 292.0 K and 1.10
atm. Upon further analysis, the compound is found to be 25.305% C
and 74.695% Cl. What is the molecular formula of the compound? Draw
the Lewis structure of the compound. Identify the geometry around
each carbon atom. Is this compound polar

1. What is the equation used to find the molecular weight of a
gas?
2. Why is a vapor unlikely to behave as an ideal gas near the
temperature at which the vapor would liquefy?
3. If 2.51 g of the vapor of a volatile liquid is able to fill a
498-mL flask at 100.°C and 775 mm Hg, what is the molecular weight
of the liquid? What is the density of the vapor under these
conditions?

Determine the molar mass of each of the following gases:
1) 0.78 g of a gas that occupies 500 mL at 0 ∘C and 1.00 atm
(STP).
2) 1.42 g of a gas that occupies 1.15 L at 0 ∘C and 760 mmHg
(STP).
3) 1.57 g of a gas that occupies 1.25 L at 680 mmHg and 19.0
∘C.
4) 2.7 g of a gas that occupies 2.4 L at 0.95 atm and 20 ∘C.

A sample of gas occupies 36.1 L at standard temperature
and pressure (STP, 0.00 0C and
1.00 atm). What is the volume of this gas, in L, at 757 torr and
26.0 0C?

What is the mass, in grams, of 475 mL of nitrogen gas at
STP?

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 3 minutes ago

asked 5 minutes ago

asked 6 minutes ago

asked 10 minutes ago

asked 10 minutes ago

asked 13 minutes ago

asked 19 minutes ago

asked 30 minutes ago

asked 37 minutes ago

asked 43 minutes ago

asked 56 minutes ago

asked 58 minutes ago