please youhave to apply this formula:
n = (P*V)/(R*T)
where P is the pressure, V is the volume of the gas, R is the gas constant, and Tis the temperature. Substituting your data, I get:
n = (0.68 * 0.75)/(0.08206 * 308.15) = 0.020 mol
since T = 273.15 + 35 = 308.15 °K
and P = 68900/101325 = 0.68 atm
Here you have a thermodynamic transformation at constant pressure, so you have to apply this equation:
T2 = T1* V2/V1
substituting your data we get:
T2 = 296.15 * 38/35 = 321.53 °K
so T1 = 48.38 °Celsius
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