Hello student
As the temperature is not mentioned lets assume it to be 273K and use the formula
KE= 3/2 RT/M
Lets calculate energy for atomic mass of Argon which is 40g
KE= 3/2 8320*273/40= 85176J
Now by crossmultiplying we get energy for 2g as
40g --------> 85176J
2g ------------> ?
= 4258.8J
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