Chemistry

Mass of empty cylinder = 14.8 kg

Mass of cylinder when full = 29 kg

Mass of gas in cylinder when filled; W₁ = 29 – 14.8 = 14.2 kg

Mass of gas in cylinder after using, W₂ = 23 – 14.8 = 8.2 kg

Initial pressure ; P₁ = 3.47 atm

Final pressure ; P₂ =?

Using

  $PV=\frac{W}{M}RT$

$P_{1}V=\frac{W_1}{M}RT..........\left(I\right)$              

$P_{2}V=\frac{W_2}{M}RT...........\left(II\right)$                 

$\frac{P_1}{P_2}=\frac{W_1}{W_2}$                

$\frac{3.47}{P_2}=\frac{14.2}{8.2}$                

P₂ = atm

Glyptal, Dacron & PHBV are polyesters.

Novalac is copolymer of phenol & formaldehyde but not polyesters.

Electrophilic addition of bromine to an alkene is anti-addition, in which cis-alkene gives two enantiomers and trans – alkene gives meso form

Here; trans-but-2-ene will give meso products

(a) $\Delta G=\Delta G°+RT\mathcal{l}nQ$

$\Delta G°=\Delta H°-T\Delta S°..............\left(1\right)$                      

At equilibrium $\Delta G=0,Q=K_{eq}$

  $\therefore \Delta G°=-RT\mathcal{l}n{K}_{eq}.................\left(2\right)$                   

$\therefore \Delta H°-T\Delta S°=-RT\mathcal{l}n{K}_{eq}$                      

$\mathcal{l}nKeq=-\left(\frac{\Delta H°-T\Delta S°}{RT}\right)$         

(b) $W_{rev}=-nRT\mathcal{l}n\left(\frac{V_f}{V_i}\right)$  

(c) $\Delta G=-T\Delta S_{Total}$ (at constant P)

$\therefore \frac{\Delta G}{\Delta S_{Total}}=-T$        

(d) $\Delta G°=-RT\mathcal{l}nKeq$

$\therefore Keq=e^{\left(-\Delta G°/RT\right)}$  

Electrophilic addition of bromine to an alkene is anti-addition, in which cis-alkene gives two enantiomers and trans – alkene gives meso form

Here; trans-but-2-ene will give meso products

${\left[Fe{\left(CO\right)}_4\left(C_2{O}_4\right)\right]}^{+}$

x + 4 * 0 – 2 * 1 = +1

x = +3

Fe⁺³ = 4s⁰ 3d⁵

In presence of strong ligand, i.e, CO.

Spin only magnetic moment

$=\sqrt[]{n\left(n+2\right)}B.M=\sqrt[]{1\left(1+2\right)}B.M$

$\sqrt[]{3}B.M.=1.73B.M$

Electrophilic addition of bromine to an alkene is anti-addition, in which cis-alkene gives two enantiomers and trans – alkene gives meso form

Here; trans-but-2-ene will give meso products

Electrophilic addition of bromine to an alkene is anti-addition, in which cis-alkene gives two enantiomers and trans – alkene gives meso form

Here; trans-but-2-ene will give meso products

Structure (I) is anti conformer.

Structure (II) is fully eclipsed conformer.

Structure (III) is skew or gauche conformer.

Structure (IV) is partially eclipsed.

$\therefore$ order of stability

(I) > (III) > (IV) > (II)

Order of P.E. is (II) > (IV) > (III) > (I).

Na/H₂ can not reduce a functional group as Na does not behaves as catalyst here.