A nebula ? a region of the galaxy where new stars are forming ? contains a very

Question

A nebula?a region of the galaxy where new stars are forming?contains a very tenuous gas with 100 atoms/cm3. This gas is heated to 7500 K by ultraviolet radiation from nearby stars.

Part A             What is the gas pressure in atm?         

A nebula?a region of the galaxy where new stars are forming?contains a very tenuous gas with 100 atoms/cm3. This gas is heated to 7500 K by ultraviolet radiation from nearby stars.

Part A             What is the gas pressure in atm?         
Part A             What is the gas pressure in atm?         

Explanation / Answer

the volume of the gas is V = 100 atoms/cm^3 = 100 x 10^6 atoms/m^3

the temperature is T = 7500 K

let P be the pressure of the gas

we know that

P x V = n x R x T

or P = (n x R x T/V)

where n = 1 mole and R = 8.314 J/mol/K

we know that

1 atm = 1.05 x 10^5 Pa

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