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Elanso [62]
3 years ago
14

Distance 100 miles. Time is 2 hours. What was the avg speed in miles per hour and miles per minute.

Chemistry
1 answer:
aleksklad [387]3 years ago
3 0
50 Miles per hour, 0.83 miles per minute
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A sample of Xe gas is observed to effuse through a pourous barrier in 4.83 minutes. Under the same conditions, the same number o
Solnce55 [7]

Answer:

28.93 g/mol

Explanation:

This is an extension of Graham's Law of Effusion where \frac{R1}{R2} = \sqrt{\frac{M2}{M1} } = \frac{t2}{t1}

We're only talking about molar mass and time (t) here so we'll just concentrate on \sqrt{\frac{M2}{M1} } = \frac{t2}{t1}. Notice how the molar mass and time are on the same position, recall effusion is when gas escapes from a container through a small hole. The time it takes it to leave depends on the molar mass. If the gas is heavy, like Xe, it would take a longer time (4.83 minutes). If it was light it would leave in less time, that gives us somewhat an idea what our element could be, we know that it's atleast an element before Xenon.

Let's plug everything in and solve for M2. I chose M2 to be the unknown here because it's easier to have it basically as a whole number already.

\sqrt{\frac{M2}{131} } = \frac{2.29}{4.83}

The square root is easier to deal with if you take it out in the first step, so let's remove it by squaring each side by 2, the opposite of square root essentially.

(\sqrt{\frac{M2}{131} } )^2= (\frac{2.29}{4.83})^2

{\frac{M2}{131} } = (0.47)^2

{\frac{M2}{131} } = 0.22

M2= 0.22 x 131

M2= 28.93 g/mol

8 0
2 years ago
3. The dry air in the Alps helped to prevent damage to the cells in the Iceman's body.
Sever21 [200]

Answer:

False

Explanation:

because they do not prevent damage they make damage

3 0
3 years ago
Why does earth look blue from space
Julli [10]

Answer:

Earth is the only planet in our solar system that has a large amount of liquid water. About 74% of the surface of Earth is covered by liquid or frozen water. Because of this, people sometimes call it the blue planet. Because of its water, Earth is home to millions of species of plants and animals.

Explanation:

Earth is the only planet in our solar system that has a massive quantity of liquid water. About 74% of the surface of Earth is covered with the aid of liquid or frozen water. Because of this, people on occasion name it the blue planet. Because of its water, Earth is domestic to thousands and thousands of species of flora and animals.

8 0
3 years ago
When you give the molecules in a gas sample more room to move,
astraxan [27]
You didn’t post the whole question :/
7 0
3 years ago
Read 2 more answers
Why is there no gas pressure in a vacuum?
kramer
 no gas pressure in a vacuum - like space 

nothing to 'contain' the gas 

we have air pressure because of gravity - 
air is like waves over the earth - i.e. high and low pressure 
high means a lot of air 
low means a little and a hurricane or stormy weather is imminent 

all the best
4 0
3 years ago
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