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lana66690 [7]
3 years ago
5

The densities of several gases at the same temperature are listed below. Considering only density, waves should travel fastest i

n which gas? Gas Density helium 0.09 kg/m3 hydrogen 0.2 kg/m3 oxygen 1.4 kg/m3 radon 9.7 kg/m3 helium oxygen radon
Chemistry
2 answers:
Nostrana [21]3 years ago
4 0
With the given options, waves can travel faster in helium as it has the lowest density, which is 0.09 kg/m3.
melomori [17]3 years ago
3 0

The answer is helium 0.09 kg/m³.

The wave will move faster in the gas that is having lowest density.

As comparison to other gases-hydrogen, oxygen and  radon; helium has the lowest density that is 0.09 kg/m³.

So, waves will move fastest in helium gas as it is having lowest density.

So the answer is helium gas that is waves will move fastest in helium gas.

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A student is instructed to make 1 L of a 2.0 M solution of CaCl2 using dry salt. How should he do this?
Pachacha [2.7K]
<span>The student should follow following steps to make 1 L of </span>2.0 M CaCl₂.<span>
<span>
1. First he should calculate the number of moles of 2.0 M CaCl</span></span>₂ in 1 L solution.<span>

</span>Molarity of the solution = 2.0 M<span>
Volume of solution which should be prepared = 1 L

Molarity = number of moles / volume of the solution

Hence, number of moles in 1 L = 2 mol

2. Find out the mass of dry CaCl</span>₂ in 2 moles.<span>

moles = mass / molar mass

Moles of CaCl₂ = 2 mol</span><span>
Molar mass of CaCl₂ = </span><span>110.98 g/mol

Hence, mass of CaCl</span>₂ = 2 mol x <span>110.98 g/mol
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3. Weigh the mass accurately 

4. Then take a cleaned and dry1 L volumetric flask and place a funnel top of it. Then carefully add the salt into the volumetric flask and finally wash the funnel and watch glass with de-ionized water. That water also should be added into the volumetric flask.

5. Then add some de-ionized water into the volumetric flask and swirl well until all salt are dissolved.

<span>6. Then top up to mark of the volumetric flask carefully. 
</span>
</span>
7. As the final step prepared solution should be labelled.
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