Home
Class 11
CHEMISTRY
Calculate DeltaH(f)^(@) for Ubr(4) from ...

Calculate `DeltaH_(f)^(@)` for `Ubr_(4)` from the `DeltaG^(@)` of reaction and the `S^(@)` values at 298 K.
`U(s)+2Br_(2)(l)rarrUBr_(4)(s), DeltaG^(@)=-788.6 kJ. " "S^(@)(J//K-"mol")50.3, 152.3, 242.6`

A

`-822.1 kJ//mol`

B

`-841.2 kJ//mol`

C

`-775.6 kJ//mol`

D

`-804.3 kJ//mol`

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaG=DeltaH-TDeltaS`
`DeltaS=242.6-50.3 -(2xx152.3), DeltaS=-112.3`
`DeltaG=-788.6xx1000=DeltaH+298xx112.3`
`DeltaH=-788.6 xx 1000 -298 xx 112.3`
`DeltaH=-822.1 " kJ mol"^(-1)`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    NARENDRA AWASTHI|Exercise Level 1 (Q.1 To Q.30)|6 Videos

  • THERMODYNAMICS

    NARENDRA AWASTHI|Exercise Level 1 (Q.31 To Q.60)|2 Videos

  • STOICHIOMETRY

    NARENDRA AWASTHI|Exercise Level 3 - Subjective Problems|20 Videos

Similar Questions

Explore conceptually related problems

Calculate Delta_(f)H^(@) (in kJ/mol) for Cr_(2)O_(3) from the Delta_(r)G^(@) and the S^(@) values provided at 27^(@) 4Cr(s)+3O_(2)(g)rarr2Cr_(2)O_(3)(s)," "Delta_(r)G^(@)=-2093.4kJ//mol S^(@)("J//K mol") : S^(@)(Cr,s)=24," "S^(@)(O_(2),g)=205," "S^(@)(Cr_(2)O_(3),s)=81

Calculate DeltaG^(@) and log K_(c) for the following reaction at 298 K : 2Al(s)+3Cu^(2+)(aq)rarr2Al^(3+)(aq)+3Cu(s) Given E_(cell)^(@) =2.02 V

Calculate DeltaG^(Theta) for the following reaction: CO(g) +((1)/(2))O_(2)(g) rarr CO_(2)(g), DeltaH^(Theta) =- 282.84 kJ Given, S_(CO_(2))^(Theta)=213.8 J K^(-1) mol^(-1), S_(CO(g))^(Theta)= 197.9 J K^(-1) mol^(-1), S_(O_(2))^(Theta)=205.0 J K^(-1)mol^(-1) ,

Calculate standard molar entropy O_(2)(g) from the following thermodynamics data at 300 K : 4Cr(s)+3O_(2)(g)to2Cr_(2)O_(3)(s),DeltaG^(@)=-2093.4 " kJ"//mol DeltaH_(f)^(@)Cr_(2)O_(3)(s)=-1129.05" kJ"//"mole" S_(m)^(@)Cr(s)=24" J"//K" mole" S_(m)^(@)Cr_(2)O_(3)(s)=81" J"//K" mole"

Calculate the standard enthalpy of reaction for the following reaction using the listed enthalpies of reaction : 3Co(s)+2O_(2)(g)rarrCo_(3)O_(4)(s) 2 Co(s)+O_(2)(g)rarr2CoO(s)," "DeltaH_(1)^(@)=-475.8 kJ 6CoO(s)+O_(2)(g)rarr2Co_(3)O_(4)(s),DeltaH_(2)^(@)=-355.0 kJ

Compute the value of DeltaS at 298K for the reaction, H_(2)(g)+1//2O_(2)(g)toH_(2)O(g) given that, DeltaG=-228.6kJ and DeltaH=-241.8kJ

Using listed informations, calculate Delta_(r)G^(@) (in kJ/mol) at 27^(@)C Co_(3)O_(4)(s)+4CO(g)rarr3Co(s)+4CO_(2)(g) Given : At 300 K DeltaH_(f)^(@)(kJ//mol)-891,-110.5,0.0,-393.5 S^(@)(J//K-mol)102.5, 197.7, 30.0, 213.7

Calculate DeltaH^(@) for the reaction Na_(2)O(g)+SO_(3)(g)toNa_(2)SO_(4)(s) Given the following (i) Na(s)+H_(2)O(l)toNaOH(s)+(1)/(2)H_(2)(g) , DeltaH^(@)=-146 kJ (ii) Na_(2)SO_(4)(s)+H_(2)O(l)to2NaOH(s)+SO_(3)(g) , DeltaH=+418 kJ (iii) 2Na_(2)O(s)+2H_(2)(g)to4Na(s)+2H_(2)O(l) , DeltaH=+259kJ