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PH221-Lab 2

# PH221-Lab 2 - Julia Bielaski 0163140 Lab Report#2 PH 232...

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Julia Bielaski 0163140 Lab Report #2 PH 232

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Objective : The purpose of this lab was to find the variation in the number of molecules, N, when using two different laws. In the first part of the lab, the number of molecules needed to be found in a sample of air column using Boyle’s Law. Boyle’s law relates volume and pressure indirectly; volume is related to 1 over pressure. The second part of the lab used Charles’ Law, which states that volume is directly related to temperature. In this part, pressure is constant and the angle, beta, stays at zero degrees while the temperature varies. Method : Table 1: Constants P ° : atmospheric pressure 101.325x10 3 N/m 2 g 9.81 m/s 2 N a : Avogadro’s Number 6.022x10 23 /mol R: gas constant 8.314 J/mol*K ρ m 13.6x10 3 kg/m 3 T= t ° C + 273.15 Mass of mercury: m=volume Hg*density Hg m=l m *A* ρ m Equation 1: P=P 0 + l m * ρ m *g*cos( β ) Equation 2: N(1)=N A *A s 1 *RT Slope=s 1 =A/nRT ~note: n(1)=n measured by method one n(1)=A/ s 1 *RT=N(1)/N A Equation 3: P=P 0 + ρ m *l m *g Equation 4: N(2)=s 2 (P 0 + ρ m *g*l m )A*N A R
Slope=s 2 =n(2)R (P 0 + ρ m *g*l m )A n(2)= s 2 (P 0 + ρ m *g*l m )A*N A = N(2) / N A R Area= π r 2 d=.94mm=9.4x10 -4 m r=d/2=4.7x10 -4 m A= π (4.7x10 -4 ) 2 =6.9x10 -7 m 2 Data and Results : Table 2: Measuring the Diameter of The Mercury Column Trial Number Diameter (mm) 1 .9 2 .8 3 1.1 4 1.0 5 .9 d=.94mm l Hg =92.9mm Table 2: Boyle’s Law Data β ( ° ) P (N/m 2 ) l a (mm) 1/l a (1/m) 0 113.629x10 3 71.7 13.95 10 113.441x10 3 73.1 13.68 20 112.881x10 3 73.2

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PH221-Lab 2 - Julia Bielaski 0163140 Lab Report#2 PH 232...

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