if you want to remove an article from website contact us from top.

# a system consisting of rhombic sulphur, monoclinic sulphur and vapour in equillibrium is

Category :

### Mohammed

Guys, does anyone know the answer?

get a system consisting of rhombic sulphur, monoclinic sulphur and vapour in equillibrium is from screen.

Rhombic and monoclinic sulphur are at equilibrium at the transition temperature (95.5

Question o

C). The enthalpy of transition at 95.5

o C is 353.8 Jmol −1

. The entropy of transition is:

A0.064 J K

−1 mol −1

B0.96 J K

−1 mol −1

C0.016 J K

−1 mol −1

D0.008 J K

−1 mol −1 Hard Open in App Solution Verified by Toppr

Correct option is B)

T=95.5+273=368.5K

ΔH=+353.8Jmol −1

Now, at equilibrium,

ΔS= T ΔH ​ = 368.5 353.8 ​ ΔS=0.96 JK −1 mol −1 Now at T>95.5 o

C,T.ΔS>ΔH,i.e.,ΔG=−ve or the forward reaction will proceed, i.e.,S

M ​

is more stable above 95.5

o C.

1 1

स्रोत : www.toppr.com

## One Component Phase Systems: Sulphur System

One Component Phase Systems: Sulphur System The phase diagram of sulphur is somewhat more complicated than that of water although both are one component

CHEMISTRY

## One Component Phase Systems: Sulphur System

Phase Equilibria

One Component Phase Systems: Sulphur System

The phase diagram of sulphur is somewhat more complicated than that of water although both are one component systems. A phase is defined as “a homogeneous, physically distinct and mechanically separable portion of the system, which is separated from other such parts of the system by definite boundary surface”.

Sulphur can exist in four different phases:

(i) Two well-defined crystalline allotropic forms in the solid state, e.g.,

Monoclinic sulphur, Sm

Rhombic sulphur, Sr

At room temperature rhombic sulphur is more stable and on heating, it passes on to monoclinic sulphur which exists within a range of temperature and pressure hounded by PQR (Figure). The temperature at which rhombic sulphur passes on to the monoclinic form is 95.50 C. This is known as the transition temperature for rhombic sulphur to get converted into monoclinic sulphur.

(ii) Liquid Sulphur, Sl.

(iii) Sulphur Vapour, Sv

In all these phases we are dealing with the same chemical entity, sulphur. So, it is a one component system. The system can be easily understood if the water system has been carefully studied. The important features of this system will be clear if reference is made to Figure, which is a pressure-temperature (P – t) diagram.

Fig: Phase diagram (P–t) of sulphur (schematic)

In the Figure, the following can be identified:

(a) The solid curves AP, PR, PQ, QB, QR and RT and the dotted curves PS, QS and RS. Alone these curves the system is univariant, i.e., any one of the two variables temperature and pressure will define the system.

(b) Well-defined areas to the right of lines AP, PQ and QB, area above RQB, area to the left of APRT, an area enclosed by PQR. Within any of these areas, the system is bivariant, i.e., the values of both temperature and pressure have to be stated it defines a point.

(c) The points P, Q, R and S. All four of these are triple points as at each point three phases co-exist and the system becomes invariant. The three phases that co-exist are different at different temperatures and pressures.

As in the case of water each of the solid curves shows equilibrium between two phases:

Along AP solid rhombic sulphur is in equilibrium with vapour and the curve shows, the variation of the vapour pressure of rhombic sulphur with temperature. This is the sublimation curve of rhombic sulphur.

Along PR rhombic sulphur is in equilibrium with monoclinic sulphur and the curve shows the variation of the transition temperature for the conversion of rhombic sulphur to monoclinic sulphur at different pressures.

The curve PQ shows the variation of the vapour pressure of monoclinic sulphur with temperature. Along PQ monoclinic sulphur is in equilibrium with vapour. It is the sublimation curve for monoclinic sulphur.

The curve QB shows the variation of the vapour pressure of liquid sulphur with temperature. Along with QB liquid, sulphur and vapour are in equilibrium. The curve shows the effect of pressure on the boiling point at sulphur.

Along with QR monoclinic sulphur ad liquid sulphur is in equilibrium and the curve shows the variation of the melting temperature of monoclinic sulphur with pressure.

The dotted curves PS, QS and RS show temperature/pressure values for the metastable equilibria – PS between rhombic sulphur and vapour. QS between solid monoclinic sulphur and vapour and RS between solid rhombic sulphur and liquid.

The curve RT represents equilibrium between solid rhombic sulphur and liquid sulphur and shows the effect of pressure on the melting point of rhombic sulphur. Similarly, it can be pointed out that to the left of the curve APR the system consists of only rhombic, sulphur, in the area to the right of APQB sulphur exists only in the vapour phase, the area bounded by PQR defines the region of temperature and pressure where monoclinic sulphur can exist and the region between the lines RQ and QB is where sulphur is in the liquid state.

स्रोत : qsstudy.com

## The temp. at which rhombic sulphur and monoclinic sulphur exist in equilibrium is

The temp. at which rhombic sulphur and monoclinic sulphur exist in equilibrium is

Home > English > Class 12 > Chemistry > Chapter > 16th Group Elements >

The temp. at which rhombic sul...

The temp. at which rhombic sulphur and monoclinic sulphur exist in equilibrium is

Collapse

Khareedo DN Pro and dekho sari videos bina kisi ad ki rukaavat ke!

1 week ₹149 ₹99 ₹99 / week Buy Till 31st March ₹611 ₹475 ₹206 / month Buy 1 year ₹4,799 ₹1,499 ₹123 / month Buy 2 years ₹9,600 ₹2,399 ₹98 / month Buy ADVERTISEMENT

Updated On: 27-06-2022

Text Solution A 98 ∘ C 98∘C B 95.5 ∘ C 95.5∘C C 240 ∘ C 240∘C D 120 ∘ C 120∘C Answer

Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.

## Related Videos

648533440 2 9.7 K 3:45

Rhombic sulphur and monoclinic sulphur are

Which of the following statement(s) is/are correct?

214113166 9 400 1:41

Rhombic sulphur is stable at room temp. Monoclinic sulphur is stable at room temp Both rhombic and monoclinic sulphur has the molecular formula

S 8 S8

Both rhombic and monoclinic sulphur are soluble in

C S 2 CS2 11479728 5 3.1 K 1:27

Rhombic and monoclinic sulphur are _____.

643010384 0 5.2 K 4:38

Rhombic and monoclinic sulphur are:

644129032 2 3.0 K 5:17

Rhombic and monoclinic sulphur are _____.

647280858 5 600 3:23

The transition temperature between Rhombic sulphur and monoclinic sulphur is

Popular Chapters by Class:

Class 6 Algebra

Basic Geometrical Ideas

Data Handling Decimals Fractions Class 7

Algebraic Expressions

Comparing Quantities

Congruence of Triangles

Data Handling

Exponents and Powers

Class 8

Algebraic Expressions and Identities

Comparing Quantities

Cubes and Cube Roots

Data Handling

Direct and Inverse Proportions

Class 9

Areas of Parallelograms and Triangles

Circles Coordinate Geometry Herons Formula

Introduction to Euclids Geometry

Class 10

Areas Related to Circles

Arithmetic Progressions

Circles Coordinate Geometry

Introduction to Trigonometry

Class 11 Binomial Theorem

Conic Sections

Introduction to Three Dimensional Geometry

Limits and Derivatives

Class 12

Application of Derivatives

Application of Integrals

Continuity and Differentiability

Determinants

Differential Equations

Terms And Conditions

स्रोत : www.doubtnut.com

Do you want to see answer or more ?
Mohammed 10 day ago

Guys, does anyone know the answer?