(a) An ideal gas occupies a volume of 1.8 cm3 at 20°C and atmospheric pressure. Determine the number of molecules of gas in the container.
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Volume of gas = 1.8cm3 = 1.8*10-3 dm3
Pressure of gas = 1atm (you didn’t mention)
Temperature= 20C0 = 293K
Number of molecules = ?
n= (1) (1.8*10-3)/(0.0821) (293)
n= 7.4827*10-5 mol
Number of molecules = moles * Avogadro’s number
Number of molecules = 7.4827*10-5 * 6.02*1023
Number of molecules = 4.5045*1019 molecules
Volume of gas = 1.8cm3 = 1.8*10-6 m3
Pressure of gas = 2.4*10-11 Pa
Number of moles = ?
n= (2.4*10-11) (1.8*10-6)/(8.314)
n= 1.7733*10-20 mol
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