Question

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.

Answer #1

Density of air ( where is mass of air, is volume of air)

Using ideal gas equation,

Molecular weight of air

, , and

If 100 g of air consists of 77% by weight of nitrogen (N2,
molecular weight = 28), and 23% by weight of oxygen (O2, molecular
weight = 32), calculate (a) the mean molecular weight of air, (b)
mole fraction of oxygen, (c) concentration of oxygen in mol/m3 and
kg/m3, if the total pressure is 1.5 atm and the temperature is
25°C.

On a hot summer day, the density of air at atmospheric pressure
at 34.5°C is 1.1242 kg/m3.
(a) What is the number of moles contained in 1.00 m3 of an ideal
gas at this temperature and pressure? mol
(b) Avogadro's number of air molecules has a mass of 2.82 ✕ 10−2
kg. What is the mass of 1.00 m3 of air? (Assume air is an ideal
gas.) kg
(c) Does the value calculated in part (b) agree with the stated...

1.If atmospheric pressure is 1.013 x 105
N/m2 and creates a column of mercury 760 mm high. What
is the density of mercury in kg/m3 ?
No units needed.
2.A car jack works when a mechanic uses a force 1.5 N, on a
small piston of radius 6 cm. What force can he exert on a larger
piston of radius 0.39 m ?
3If atmospheric pressure is 1.013 x 105
N/m2 , what height of water in meters would it...

A hot air balloon is operated with the inside
temperature of 125oF when the outside temperature is
52oF. What must be the minimum volume of this balloon to
carry a 300-kg load (including its own mass)? The atmospheric
pressure is 1.013×105 Pa and the molecular mass of air
is 29 atomic mass units.

What is the density (in kg/m3) of nitrogen gas (molecular mass =
28 u) at a pressure of 2.0 atmospheres and a temperature of 310
K?

The envelope and basket of a hot-air balloon have a combined
weight of 2.36 kN, and the envelope has a capacity (volume) of 2.29
x 103 m3. When it is fully inflated, what
should be the temperature of the enclosed air to give the balloon a
lifting capacity (force) of 2.64 kN (in addition to the
balloon's weight)? Assume that the surrounding air, at 20.0°C, has
a weight per unit volume of 11.9 N/m3 and a molecular
mass of 0.0280...

1.
You purchase 9.3 gallons of gasoline. Assume that the properties of
gasoline are Molecular weight (Mw) = 113, Specific Gravity (SG) =
0.70. Remember that the density of water is 62.4 lbm/ft^3. What is
the weight in lbf of the gasoline? and how many g ? moles are there
in this quantity of gasoline?
2. Recall that the ideal gas law is P V = nRT where P is
pressure, V is volume, n is number of moles, R...

A 1 liter solution of diluted liquid chloroform with toluene is
in a sealed container. The mole fraction of chloroform in the gas
phase was measured at 1500 ppmv once the solution was prepared. The
molecular weight is 119.35 g/mol for chloroform and 92.13 g/mol for
toluene. The vapor pressure of chloroform and toluene are 151 mmHg
and 28.1 mmHg, respectively.
What must the volume of liquid chloroform be in order to
make a 1.0 liter total volume solution?
What...

⦁ A gas with a molecular weight of 28.0, a critical
temperature of 300 K, and a critical pressure of 4.0 KPa. Calculate
the density in kg/m3 of this gas at 450 K and 8.0 KPa
⦁ if the gas is ideal
⦁ if the gas obeys the law of corresponding
states.

On a sunny morning the atmospheric pressure is 10^5 N/m^2 and
the temperature is 279 K and you are at a family reunion. A balloon
has been filled with 1000m^3 of preheated air at atmospheric
pressure and a temperature of 300 K. The mass of the empty balloon
and its load is 240 Kg. Under these conditions, the balloon rises
above its burden, but the airship remains grounded. To begin the
ascent, the air within the balloon is brought to...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 20 minutes ago

asked 26 minutes ago

asked 30 minutes ago

asked 30 minutes ago

asked 39 minutes ago

asked 52 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago