PHYSICS HIGH SCHOOL

A mass of gas has a volume of 4m3, a temperature of 290k, and an absolute pressure of 475 kpa. When the gas is allowed to expand to 6.5m3, it's new temperature is 277K. What's the absolute pressure of the gas after expansion?

Answers

Answer 1
Answer:

Given:

V1 = 4m3

T1 = 290k

P1 = 475 kpa = 475000 Pa

V2 = 6.5m3

T2 = 277K

Required:

P

Solution:

n = PV/RT

n = (475000 Pa)(4m3) / (8.314 Pa-m3/mol-K)(290k)

n = 788 moles

P = nRT/V

P  = (788 moles)(8.314 Pa-m3/mol-K)(277K)/(6.5m3)

P = 279,204 Pa or 279 kPa

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Calculate the buoyancy of the balloon as "grams lift," that is, the difference between the mass of an equal volume of dry air at the same temperature and pressure and the mass of the He in the balloon. Assume the molar mass of air is 28.8 g/mol.

Answers

Explanation:

Since, the given balloon contains equal volume of dry air at the same temperature and pressure therefore, moles of air filled is equal to the moles of helium gas.  

Moles of air is 228363.69 moles and molar mass of air is 28.8 g/mol.

As we know that,  

     No. of moles of air = \frac{mass}{\text{molar mass}}

          228363.69 mol = (mass)/(28.8 g/mol)

                 mass = 6576874.341 g

Therefore, mass left is as follows.

                 6576874.341 g - 913454.77 g     (as 913454.77 g = mass of He)

                = 5664419.57 g                              

Thus, we can conclude that mass left is 5664419.57 g.

In the easiest definition what is inertia

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Answer:

Aproperty of matter by which it remains at rest or in motion in the same straight line unless acted upon by some external force

A 2.75 kg sample of a substance occupies a volume of 250 cm³ . Find the density in g/cm³ and kg/m³

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