First you have to find the number of moles , then you have to apply stoichometry to find the number of moles of H2 gas , after that you can determine its mass.
Answer:
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Explanation:
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When the solute can no longer dissolve in the solution the solvent becomes SATURATED. When no more solute can dissolve and if you look at the bottom of the beaker, test tube, pan, or glass of cold tea you can see the solute permeating out as little particles .
Answer: 0.43molO₂
Explanation:
The ideal gas law for moles is
. If you did not know, R is the ideal gas constant,
.
Since the temperature must be in Kelvin, we must convert our given temperature from ℃ to K. 
Now that we have the temperature converted to Kelvin, we can plug in our information to the ideal gas law for the number of moles.



Therefore, the number of moles is 0.43molO₂.
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