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Look for the S° of the reactants and product. What is the ∆S of Ca3(PO4)2(s) ---> 3Ca2+(aq) + 2PO43-(aq)?
What is the ∆S of N2(g) + 3H2(g) ---> 2NH3(g)?
Given
N2(g)
(J/mol x K) = 191.5
H2(g)
(J/mol x K) = 130.6
NH3(g)
(J/mol x K) = 192.3
What is the total entropy change for the decomposition of hydrogen peroxide.
2H2O2(l) ---> 2H2O(l) + O2(g)
Given
H2O2(l)
(J/mol x K) = 109.6
(kJ/mol) = -187.8
H2O(l)
(J/mol x K) = 69.9
(kJ/mol) = -285.8
O2(g)
(J/mol x K) = 205.0
(kJ/mol) = 0
True or False
1. The second law of thermodynamics states that for a spontaneous process, the net energy of the system and its surroundings is always negative.
2. A positive ∆S signifies a drop in randomness.
3. A spontaneous process requires the action of external forces.
4. Thermodynamic properties include enthalpy, entropy and Gibbs free energy.
5. A negative free energy change indicates a spontaneous process.
6. Negative entropy change indicates increase in orderliness.
7. Thermodynamic properties are used to predict the spontaneity of a chemical process.
8. Enthalpy, entropy and Gibbs free energy are governed by the law of thermodynamics.
9. A spontaneous process occurs naturally.
True or False
10. Enthalpy is a measure of heat and randomness.
11. Entropy change is positive when heating liquid water to its boiling point.
12. Gibbs free energy is a measure of available energy.
13. The solid phase is the most random state hence, has the lowest entropy.
14. In freezing of water, entropy change will be positive because particles in ice are less orderly arranged than those of the liquid.
15. The spontaneity of a process depends on the total change in entropy.
A 550 J of work on the refrigerant during compression. How much is the change in the internal energy when 1, 000 J of heat is absorbed?
An 88.5 –g piece of iron whose temperature is 78.8 0 C is placed in a beaker containing 244 g of water at 18.8 0 C.
When thermal equilibrium is reached, what is the final temperature? (Assume no energy is lost to warm the
beaker and its surroundings). Cp of water is 4.184 J/g0C and the Cp of iron is 0.446 J/g 0C.
Write the equilibrium expression, K eq , for each of the following reactions:
1. 2 NO (g) + O 2(g) ⇌2 NO 2(g)
2. 4 HCl (g) + O 2(g) ⇌2 H 2 O (g) + 2 Cl 2(g)
3. NOCl (g) ⇌NO (g) + ½ Cl 2(g)
4. Fe 3+ (aq) + SCN - (aq) ⇌FeSCN 2+ (aq)
5. CaCl 2(s) ⇌Ca 2+ (aq) + 2Cl - (aq)
6. HC 2 H 3 O 2(aq) + H 2 O (l) ⇌ H 3 O + (aq) + C 2 H 3 O 2 - (aq)
7. MgO (s) + CO 2(g) ⇌ MgCO 3(s)
8. C (s) + CO 2(g) + 2Cl 2(g) ⇌ COCl 2(g)
9. Ca 3 (PO 4 ) 2(s) ⇌ 3 Ca 2+ (aq) + 2 PO 4 3- (aq)
10. ZnO (s) + CO (g) ⇌ Zn (s) +CO 2(g)
PLEASE ANSWER MY QUESTION QUICKLY !!
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DEADLINE : 04/23/2022 11 : 00 PM
The head of a golf club might contain 250 grams of titanium. How many moles is this?
How to round off 0.01887006076 moles
