At STP, if 5.6 litres of a gas weights \(7.5 \mathrm{~g}\), then identify the gas.
At STP, if 5.6 litres of a gas weights \(7.5 \mathrm{~g}\), then identify the gas.
\(\mathrm{CO}\)
\(\mathrm{NO}\)
\(\mathrm{NO}_2\)
\(\mathrm{CO}_2\)
Solution
One mole of gas at STP occupies \(22.4 \mathrm{~L}\).
Thus, 5.6 L of gas at STP contains 0.25 moles.
Number of moles \(=\) weight in gram \(/\) molecular weight
\(\begin{aligned}
0.25 & =7.5 / M \\
M & =30
\end{aligned}\)
Thus, the gas is NO.
Hence, the correct option is (b).