Under 3atm , 12.5 litre of a certain gas weigh 15g. Calculate the average speed of gaseous molecules.

Question

$\begin {array}{1,1}(a)\;7\times10^4cm\;sec^{-1}\\(b)\;8.028\times10^4cm\;sec^{-1}\\(c)\;6\times10^5cm\;sec^{-1}\\(d)\;8.028\times10^6cm\;sec^{-1} \end{array}$