tions under which the law is applicable, and give the units for each quantity in

Question

tions under which the law is applicable, and give the units for each quantity in the equation. IS e 5.16 A certain amount of gas is contained in a closed mercury manometer as shown here. Assuming no other parameters change, would h increase, de- crease, or remain the same if (a) the amount of the gas were increased; (b) the molar mass of the gas were doubled: (c) the temperature of the gas was increased; (d) the atmospheric pressure in the room was increased; (e) the mercury in the tube were re- placed with a less dense fluid: (f) some gas was added to the vacuum at the top of the right-side tube; (g) a hole was drilled in the top of the right- side tube? Vacuum Problems 5.17 A gaseous sample of a substance is cooled at con-

Explanation / Answer

a)

if we increase amount of "GAS" that is, the green substance

then, clearly the gas exerts more pressure, so it will push further the "grey" fluid

therefore, vaccum volume is compressed

b)

if MW increases by 2

if mass of green gas is fixed --> then, there are less moles, therefore, less pressure

if the amount of gas (moles) is fixed --> no effect

c)

if T increases, then

PV = nRT

If T increases, PV must increases... then, vacuum will decrease

d)

if P atm increases --> no effect, since the system is closed, volume of glassware is constant, so no effect

e)

if we replace mercury with less dense fluid, then, the pressure exerted is lower, so the green gas will expand

f)

if we add gas to the vaccum, then vaccum volume should increase, pushes down the mercury, so the green gas copmresses

g)

if we drill a hole, then:

P-vacuum --> becomes --> P atmospheric, so the mercury must be pushed down by the atmospheric pressure

Vgas decrease,s i.e. it is compressed

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