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2 years ago

For each pair of gases, select one that most likely has the highest rate of effusion. Use the periodic table if necessary

Chemistry

2 answers:

andreev551 [17]2 years ago

7 0

Hydrogen, Methane, Ammonia, and Fluorine

Explanation:

If the question was from Edge2020, then this should be the correct answer :) Hope this helps!

brilliants [131]2 years ago

4 0

You will do the highest one i think

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Imagine that a chemist is trying to establish whether a piece of rock is from a meteorite that fell from outer space. the rock c

rusak2 [61]

The sample is likely to be from a meteorite.

The reason for this is the fact that the isotope Copper-63 is more abundant on planet Earth than the isotope Copper-65 is. Therefore, if a sample of rock has Cu-65 in a greater quantity, it is likely to be from outer space. Many other elements entered the Earth's crust as a result of meteorite impacts, such as Iron (Fe).

8 0

2 years ago

What is the ph of a solution that consists of 0.50 m h2c6h6o6 (ascorbic acid) and 0.75 m nahc6h6o6 (sodium ascorbate)? ka = 6.8

bearhunter [10]

Answer:

4.34.

Explanation:

For acidic buffer:

∵ pH = pKa + log [salt]/[Acid]

∴ pH = - log(Ka) + log [salt]/[Acid]

∴ pH = - log(6.8 x 10⁻⁵) + log(0.75)/(0.50)

∴ pH = 4.167 + 0.176 = 4.343 ≅ 4.34.

4 0

2 years ago

Suppose you failed to mix the borax solution properly. How would this error be reflected in the average titre?

White raven [17]

Answer and Explanation :

borax is a week base which is used as a primary standard solution to standardize the acid solution there is a very good property of borax that is does not decompose easily as we discussed above that it is a week base does not soluble in water easily, so it is very necessary to proper mixing of borax in water. If there is in proper mixing of borax then it will effect the not standardize the solution and error will be reflected as high alkaline concentration

3 0

2 years ago

A sample of SO3 is introduced into an evacuated sealed container and heated to 600 K. The following equilibrium is established:

Andreas93 [3]

Answer: The value of $K_p$ is 0.050.

Explanation:

According to Raoult's law, the vapor pressure of a component at a given temperature is equal to the mole fraction of that component multiplied by the vapor pressure of that component in the pure state.

$p_x=x\times P$

As we know the mole fraction of $O_2$ is 0.12

The partial pressure of $O_2=0.12\times 3.0atm=0.36atm$

The partial pressure of $SO_2=2\times 0.36atm=0.72atm$ Thus the partial pressure of $SO_3$ is = [3 - (0.36+0.720)] atm = 1.92 atm

$p_{SO3}$ = 1.92 atm

$2SO_3(g)\rightleftharpoons 2SO_2(g)+O_2(g)$

$K_p=\frac{p_{O_2}\times (p_{SO_}2)^2}{(p_{SO_3})^2}$

$K_p=\frac{0.36\times (0.72)^2}{(1.92)^2}$

$K_p=0.050$

The value of $K_p$ is 0.050.

7 0

2 years ago

A mixture of three gases has a total pressure at 298 K of 1560 mm Hg. the mixture is analyzed and is found to contain 1.50 mol N

Agata [3.3K]

Answer:

the partial pressure of Xe is 452.4 mmHg

Explanation:

Dalton's law of partial pressures says that in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases.

The partial pressures can be calculated with the molar fraction of the gas, in this case, Xe.

Molar fraction of Xe is calculated as follows:

$x_{Xe}=\frac{n_{Xe} }{n_{t} }$

$x_{Xe}=1.75/5.9\\x_{Xe}=0.29$

Then, 0.29 is the molar fraction of Xe in the mixture of gases given.

To know the parcial pressure of Xe, we have to multiply the molar fraction by the total pressure:

Partial Pressure of Xe=1560mmHg*0.29

Partial Pressure of Xe=452.4mmHg

7 0

2 years ago