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At what temperature root mean sqaure of `N_(2)` gas is equal to that of propance gas at `STP` conditions.

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At what temperature root mean sqaure of `N_(2)` gas is equal to that of propance gas at `STP` conditions.
A. `173.7^(@)C`
B. `173.7K`
C. `273 K`
D. `- 40^(@)C`
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Correct Answer - B
`v_(rms) (N_(2)) = v_(rms) (C_(3) H_(8))`
`sqrt((3RT)/(28)) = sqrt((3R 273)/(44))`
`T = 173.7 K`
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