Suppose the temperature of 4.70 L of ideal gas drops from 385 K to 275 K. (a) If

Question

Suppose the temperature of 4.70 L of ideal gas drops from 385 K to 275 K. (a) If the volume remains constant and theinitial pressure is atmospheric pressure, find the finalpressure.
4 Pa

(b) Find the number of moles of gas.
5 mol
any help would be appreciated! Suppose the temperature of 4.70 L of ideal gas drops from 385 K to 275 K. (a) If the volume remains constant and theinitial pressure is atmospheric pressure, find the finalpressure.
4 Pa

(b) Find the number of moles of gas.
5 mol
any help would be appreciated! (a) If the volume remains constant and theinitial pressure is atmospheric pressure, find the finalpressure.
4 Pa

(b) Find the number of moles of gas.
5 mol
any help would be appreciated!

Explanation / Answer

      Given that the initial volume is V =4.70 L = 4.70*10-3 m3       Initial temperature is T1= 385K       Final temperature is T2 = 275K --------------------------------------------------- atmospheric pressure is P1 = 1.013*105 Pa For ideal gas P1*V1 / T1 = P2*V2 / T2                           P1 / T1 = P2/T2                (since V1 = V2 )                                  P2 = P1*T2 / T1                                        =-------*105 Pa From ideal gas equation                  N = P1*V1 / kT1    = --------- molecules    where k = 1.38*10-23 J/K                      Then the number of moles is n = N / NA                                                = --------- moles where NA = 6.022*1023 molecules/mol

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