Item 12 Part A Learning Goal To understand several methods of measuring gas pres

Question

Item 12 Part A Learning Goal To understand several methods of measuring gas pressure On a rainy day, a barometer reads 739 mmHg. Convert this value to atmospheres Express your answer numerically in atmospheres Gases exert a measurable pressure (P) on the walls of their container The SI unit for pressure is the pascal (Pa). Other pressure units frequently used in chemistry are millimeters of mercury (mmHg) and atmospheres (atm). You can convert between units of pressure using conversion factors such as those indicated below atm 1 atm 760 mmHg = 101, 325 Pa Submit Hints My Answers Give Up Review Part Part B A closed container is filled with oxygen. The pressure in the container is 435 kPa What is the pressure in millimeters of mercury'? Express the pressure numerically in millimeters of mercury Figure 1 of 1 mmHg as 18 cm Submit Hints My Answers Give Up Review Part Part C What is the pressure (in atmospheres) of the gas inside the container connected to an open-end, mercury-filled manometer as shown in the picture? (Fiqure 1) The atmospheric pressure is 0.95 atm. Express your answer numerically in atmospheres

Explanation / Answer

1 atm = 760 mm Hg

x atm = 739 mm Hg

x= 736/760 = 0.9723 atm

b)

101.325 Kpa = 760 mm Hg

435 kPa = x

x=435*760 = 330,600 / 101.325 = 3262.768 mm Hg

c)

P= rho*g*h = rho_mercury = 13,600 Kg / m^3

P= 13,600*9.81*0.18 = 24,014.88 Pa = 24.01488 KPa

101.325 kPa = 1 atm

24.01488 kPa = x

x= 24.01488 / 101.325 = 0.237 atm

gas pressure: 0.237+0.95 = 1.187 atm

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