Physics

Automobiles air bags are inflated with $N_{2}$ gas which is formed by the decomposition of solid sodium azide $(NaN_{3})$. The other product is $Na - metal$. Calculate the volume of $N_{2}$ gas at $27^{\circ}C$ and $756\ Torr$ formed by the decomposing of $125\ gm$ of sod azide.

SOLUTION
Sodium azide $(NaN_3)$ decomposes as:
$2NaN_3\rightleftharpoons 2Na+3N_2$
Here, we see that at STP,
$2$ moles of sodium azide produces $3$ moles of $N_2=(22.4\times3)=67.2L$ of $N_2.$
Or,
$130g$ of $NaN_3$ produces $67.2$ of $N_2$gas. Here,$P_1=1atm,T_1=273K, V_1=64.5L$Also given that,$P_2=756$for$r=0.9atm.T_2=27+273=300K$We have,$\cfrac{P_1V_1}{T_1}=\cfrac{P_2V_2}{T_2}\\ \cfrac{1\times 64.6}{273}=\cfrac{0.9\times V_2}{300}\\\text{Volume of }N_2\text{ gas}=78.8L$You're just one step away Create your Digital Resume For FREE on your name's sub domain "yourname.wcard.io". Register Here! Subjective Medium Published on 18th 08, 2020 Questions 244531 Subjects 8 Chapters 125 Enrolled Students 218 Realted Questions Q1 Single Correct Medium Dimensional analysis of the equation${ \left( Velocity \right) }^{ x }={ \left( Pressure \ difference \right) }^{ \frac { 3 }{ 2 } }.{ \left( density \right) }^{ \frac { -3 }{ 2 } }$gives the value of$x$as: • A. 1 • B. 2 • C. 3 • D. -3 Asked in: Physics - Units and Measurement 1 Verified Answer | Published on 18th 08, 2020 Q2 Single Correct Medium The order of magnitude of$379$is • A.$1$• B.$2$• C.$3$• D.$4$Asked in: Physics - Units and Measurement 1 Verified Answer | Published on 18th 08, 2020 Q3 Single Correct Medium Turpentine oil is flowing through a capillary tube of length$l$and radius$r$. The pressure difference between the two ends of the tube is$p$. The viscosity of oil is given by:$\eta=\dfrac {p(r^2-x^2)}{4vl}$. Here v is velocity of oil at a distance$x$from the axis of the tube. From this relation, the dimensional formula of$\eta$is • A.$[ML^{-1}T^{-1}]$• B.$[MLT^{-1}]$• C.$[ML^{2}T^{-2}]$• D.$[M^0L^{0}T^{0}]$Asked in: Physics - Units and Measurement 1 Verified Answer | Published on 18th 08, 2020 Q4 Subjective Medium Find the domensions of moment of interia I. Some of the equations involving these quantities are$\omega =\dfrac{\theta_2-\theta_1}{t_2-t_1}, \alpha =\dfrac{\omega_2-\omega_1}{t_2-t_1}, \Gamma =F.r$and$I=mr^2$\$. The symbols have standard meanings.

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q5 Single Correct Medium
A dimensionless quantity
• A. never has a unit
• B. always has a unit
• C. may have a unit
• D. does not exist

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020