Question

35ml of dry $H_2$ gas were collected at $6^{o}C$ and 758 mm pressure. What is the volume in ml of $H_2$ at STP?

• A. 32
• B. 24.6
• C. 34.16
• D. 30.16

Answer 1

The correct option is C 34.16

$V_1=35ml$, $P_1=\frac{758}{760}=0.9974bar$, $T_1=273+6=279K$

$V_2=?$, $P_2=1bar$, $T_2=273K$

Now, $\frac{P_2{V}_2}{T_2}=\frac{P_1{V}_1}{T_1}$

$\Rightarrow V_2=\frac{0.9974bar\times 35ml}{279K}\times \frac{273K}{1bar}$

$=34.16ml$

$\therefore$ At STP the volume of $H_2$ is $34.16ml$ .