Determine the standard entropy change for the decomposition of one mole of solid calcium carbonate

Monjur Alahi

Determine the standard entropy change for the decomposition of one mole of solid calcium carbonate, forming solid calcium oxide and carbon dioxide gas.


0 like 0 dislike
6 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

This is a straight-forward application of Equation 2, followed by substitution of the Appropriate values from a table. 

 CaCO3(s) → CaO (s) + CO2 (g) 

ΔS° = (1 mol) [ΔS° for CaO (s)] + (1 mol) [ΔS° for CO2(g)] – (1 mol)[ΔS° for CaCO3(s)] 

= (1 mol) (39.8 J/mol K) + (1 mol) (213.7 J/mol K) – (1 mol) (92.9 J/mol K) = 160.6 J/K.

0 like 0 dislike
6 views
Talk Doctor Online in Bissoy App
Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime.

(B) (ii) and (iii) Slaking of lime is accompanied by liberation of heat, hence it is an exothermic reaction. Calcium hydroxide is an alkali and its aqueous solution (i.e., lime water)...

1 Answers 1 views
Marble contains ,(A) calcium hydroxide (B) calcium chloride (C) calcium carbonate (D) calcium oxide

(C) calcium carbonate Marble contains calcium carbonate and its chemical formula is CaCO3.​

1 Answers 1 views
Predict the entropy change in- (i) A liquid crystallizes into solid (ii) Temperature of a crystalline solid raised from 0K to 115K

(i) Entropy decreases because molecules attain an ordered state.  (ii) Entropy increases because from 0K to 115K average kinetic of molecules increases. 

1 Answers 2 views
What is meant by entropy driven reaction? How can the reaction with positive change of enthalpy and entropy be made entropy driven?

The free energy change of a reaction is given by ΔG = ΔH – TΔS  For a reaction to be spontaneous, ΔG should be –ve.  If both ΔH and ΔS are positive...

1 Answers 1 views
Calculate the entropy change in the surroundings when 1.00 mol of H2O (l) is formed under standard conditions: Δ fH0 = - 286 kj mol^-1.

H2 (g) + ½ O2 (g) ---> H2O (g), Δf H0 = -286kj mol-1  This means that when 1 mol of H2O (l), is formed , 286 kj of heat is...

1 Answers 2 views
Calculate ΔG° for the reaction in Example 1, the decomposition of calcium carbonate, from ΔH° and ΔS° values.

We have already calculated ΔS° for the reaction CaCO3(s) → CaO (s) + CO2 (g) as 160.6 J/K. We can find ΔH° for the reaction in a similar manner:  ΔH° = (1...

1 Answers 1 views
The major chemical compound found in kidney stones is : (a) urea (b) calcium carbonate (c) calcium oxalate (d) calcium sulphate

(c) The composition of kidney stone is Calcium oxalate                – 80% Uric acid                           – 5% Amino acid cystine             – 2 % Magnesium and                 – 13% ammonium phosphate

1 Answers 1 views
Which one of the following will produce permanent hardness in water ? a) Sodium sulphate b) Calcium carbonate

c) Calcium sulphate

1 Answers 1 views
Write the balanced chemical equations for the following reactions. (a) Calcium hydroxide +Carbon dioxide → Calcium carbonate + Water

(a) Ca(OH)2+CO2  → CaCO3+H2O (b) Zn+2AgNO3 →  Zn(NO3)2+2Ag (c) 2Al+3CuCl2 → 2AlCl3+3Cu (d) BaCl2+ K2SO4 → BaSO4+2KCl

1 Answers 1 views
Acid rain reacting with calcium forms: I. Calcium bicarbonate II. Calcium Nitrate

(b) Acid rain reacts with calcium to form calcium bicarbonate, which can be easily washed away.

1 Answers 1 views
X