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There are several values, most of which are related, but vary according to the units used. See //en.wikipedia.org/wiki/Gas_constant for details.

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Q: Which value of gas constant should be applied?
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Is gas constant equal to planks constant?

No, gas constant is having a value of 8.314Jk-1mol-1 Whereas plancks constant has a value of 6.6*10-31


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What will happen if a gas is held at a constant temperature has a increase in pressure applied to it?

The volume of the gas will decrease. the gas will also attempt to increase in temperature.


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Suggestions for percent error R gas constant?

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What is the importance of your choice of units in expressing the value of the ideal gas law constant?

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