Chemistry, 19.07.2019 15:50 kimberlylove387

A3.0-l sample of helium was placed in a container fitted with a porous membrane. half of the helium effused through the membrane in 24 hours. a 3.0-l sample of oxygen was placed in an identical container. how many hours will it take for half of the oxygen to effuse through the membrane?

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Answer from: m3xl0v3

M in this equation is molar mass. If A is He and B is O2 then MA = 4 g/mol and MB = 32 g/mol rate A = 1.5L/24hr rate B = 1.5L/?hr and rateA/rateB = ?/24

Answer from: FrankyV4387

It will take 68.182 hours for half of the oxygen to effuse through the membrane

Further explanation

Graham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or

the effusion rates of two gases = the square root of the inverse of their molar masses:

$\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }$

$\rm M_1\times r_1^2=M_2\times r_2^2$

$\rm r_{He}=\dfrac{1.5\:L}{24\:Hr}=\dfrac{1}{16}\:L/Hr\\\\r_{He}^2\times M_{He}=r_O_2^2\times M_{O_2}$

$\rm M_{He}=4,M_{O_2}=32\\\\(\dfrac{1}{16})^2\times 4=r_{O_2}^2\times 32\\\\r_{O_2}=\sqrt{\frac{1}{2048} }\\\\r_{O_2}=0.022\:L/Hr$

For 1.5 L O₂ it will take :

1.5 L : 0.022 L/Hr = 68.182 hours

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Answer from: Quest

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

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by elimination, the correct answer is b. the boiling point of the new compound increases.

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A3.0-l sample of helium was placed in a container fitted with a porous membrane. half of the helium...

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