Re: Chemistry Question help

for your problem no. 1 the equation to use is of boyle's law which is

P.V=P'.V'   (if the temp. remains constant)


for problem no . 2 the equation to be used is

V / T=V'/T'      (where the temp. is taken in kelvins)

for problem no. 3 we use   boyles and charles law combined as

(P.V)/T = (P'.V')/T' (the temp is measure in kelvins)

and since the vol. is constant it can be dropped from both sides.

as regarding prob no. 4... as we know the volume of gas directly varies with the no. of moles so we use equation

V/n=V'/n' (where n'=no of moles present + added no of moles)

for your fifth problem ideal gas equation is to be used as

(P.V)/T = (P'.V')/T'

the sixth problem is quite easy... we have to use daltons law of partial pressures according to which

total pressure = pressure exerted by first gas + pressure exerted by second gas + pressure exerted by third gas + ............


and now your seventh problem.. the molar mass of neon is 20 where as the molar mass of CO is 12+16=28 thus by grahams law of effusion... we have


rate of effusion of gas 1 / rate of effusion of gas 2 = sqrt(molar mass of gas                                                                                  1)/ sqrt(molar mass                                                                                                   of gas 2)
so the rate of effusion of a gas inversely varies with its molar mass thus we infer the rate of effusion of neon is more than that of CO.. (the same solution holds for diffusion)..

REGARDS

________________________________
From: smileyranger_iie <[email protected]>
To: [email protected]
Sent: Tuesday, November 15, 2011 6:29 PM
Subject: [The Chemistry Cluster] Chemistry Question help


  
Cn you guys please help me with the following questions? 

At constant temperature, a gas occupies a volume of 840 mL at 520 mm Hg. If we increase the pressure to 705 mm Hg, what will be the volume of the gas?

At constant pressure, a gas occupies a volume of 270 mL at 320 C. What is the volume of the gas at -210 C?

We have 950 mL of a gas at 200	C and 350 mm Hg.	If we heat the gas to 1750	C at constant volume, what will the pressure be?

A balloon holding 390 mL holds 2.8 moles of argon. If we add 3.2 moles of the gas at the same temperature and pressure, what will the volume of the balloon be?

You have 540 mL of a gas at a pressure of 723 mm Hg and a temperature of 340 C. What is the volume if you change the pressure to 840 mm Hg and the temperature to 91 0C?

A mixture of three gases is in a container. The mixture exerts a total pressure of 456 atmospheres. If gas A exerts a pressure of 195 atmospheres and gas B exerts a pressure of 97 atmospheres, what is the pressure of gas C?

Which gas will diffuse faster: Ne or carbon monoxide (CO)? Explain your answer.

Thanks!

-Smileyranger :3


 

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