Homework Answers
Entropy is the measurement of randomness and increases with increasing the disorder.
Order: solid<liquid<gas
A. dS=-ve since no of gaseous moles decreases from Reactant to products.
B. +Ve , since gaseous molecymol of products are formed from solid
C. -ve , since liquid is formed from gas
D. +Ve , since more no of gas molecules
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1. Phase change: SSolid) < SLiquid) → SGas) 2. SFewer reactant molecule) → S(More product molecules) 3. Temperature...
1.Sodium hydrogen carbonate, NaHCO3, can be decomposed completely by heating. 2 NaHCO3(s) → Na2CO3(s) + CO2(g)...
1.Sodium hydrogen carbonate, NaHCO3, can be decomposed completely by heating. 2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g) A sample of impure NaHCO3 with an initial mass of 0.739 g yielded a solid residue (consisting of Na2CO3 and other solids) with a final mass of 0.564 g. Determine the mass percent of NaHCO3 in the sample. 2.In a process for producing acetic acid, oxygen gas is bubbled into acetaldehyde, CH3CHO, containing manganese(II) acetate (catalyst) under pressure at 60°C. 2CH3CHO(l) +...
10. What is a chemical reaction? A) when a liquid undergoes a phase change and produces...
10. What is a chemical reaction? A) when a liquid undergoes a phase change and produces a solid B) when a new element is formed by rearranging nucleons C) when two solids mix together to form a heterogeneous mixture D) when two liquids mix to form a homogeneous mixture E) when one or more new compounds are formed by rearranging atoms 17. Identify the reaction type: Al2O3(s) → O2(g) + Al(s) A) combustion B) combination C) decomposition D) single replacement...
Complete and balance the following equations. 1)CO2(g)+OH−(aq) 2)NaHCO3(s)+H+(aq) 3)CaO(s)+C(s) 4)C(s)+H2O(g) 5)CuO(s)+CO(g)
Complete and balance the following equations. 1)CO2(g)+OH−(aq) 2)NaHCO3(s)+H+(aq) 3)CaO(s)+C(s) 4)C(s)+H2O(g) 5)CuO(s)+CO(g)
Complete questions 2-4 using data from table and the answer from question 1 Measuring Enthalpy Results...
Complete questions 2-4 using data from table and the answer from question 1 Measuring Enthalpy Results NaHCO3(s) + HC2H3O2(aq) à NaC2H3O2(aq) + H2O(l) + CO2(g) Trial 1 Trial 2 mass of baking soda(NaHCO3) added 5.4g 5.4g mass of vinegar added 20ml 20ml Final temperature, tf 16.7C 16.7°C Initial temperature, ti 21.1°C 21.1°C Change in temperature, ∆t 4.4°C 4.4°C q (water) = mwCwTw 467.6 J 467.6 J q(reaction) -467.6 J -467.6 J moles of NaHCO3 .0642 .0642 ΔH (kJ/mol) -7.27448 kJ/mol...
2. Finding the temperature for a phase change. Ex: What is the normal boiling point of bromine? Br, (1) Br, (g)
2. Finding the temperature for a phase change. Ex: What is the normal boiling point of bromine? Br, (1) Br, (g)
Questions 1 - 5 s) + CO2 (g) b. CO2 (s) → CO2 (g) c. 4...
Questions 1 - 5 s)
+ CO2 (g)
b. CO2 (s) → CO2 (g)
c. 4 C3H5N3O9(l) → 6 N2 (g) + 12 CO2 (g) +10 H2O (g) +O2
(g)
d. O2(g) + 2 H2 (g) → 2 H2O (g)
e. More than one correct answer present.
2. How much Lithium can be produced in 50.0 Amps is applied to
a molten LiBr for 43 minutes?
3. What is the standard electrochemical potential for an
electrochemical reaction (n=3) at 273.15...
Sodium hydroxide reacts with carbon dioxide as follows: 2 NaOH(s) + CO2(g) Na2CO3(s) + H2O(1) If...
Sodium hydroxide reacts with carbon dioxide as follows: 2 NaOH(s) + CO2(g) Na2CO3(s) + H2O(1) If 3.70 mol NaOH and 2.00 mol CO2 are allowed to react, how many moles of the excess reactant remains? 0.15 mol CO2 O 0.30 mol NaOH O 1.70 NaOH 1.00 mol CO2 How much energy is required to change the temperature of 1.50 L of water from 25.0 °C to 100.0 °C? The specific heat capacity of water is 4.184 J/g.°C; density H2O =...
Measuring Enthalpy Results NaHCO3(s) + HC2H3O2(aq) à NaC2H3O2(aq) + H2O(l) + CO2(g) Trial 1 Trial 2...
Measuring Enthalpy Results NaHCO3(s) + HC2H3O2(aq) à NaC2H3O2(aq) + H2O(l) + CO2(g) Trial 1 Trial 2 mass of baking soda(NaHCO3) added 5.4g 5.4g mass of vinegar added 20ml 20ml Final temperature, tf 16.7C 16.7°C Initial temperature, ti 21.1°C 21.1°C Change in temperature, ∆t 4.4°C 4.4°C q (water) = mwCwTw 467.6 J 467.6 J q(reaction) -467.6 J -467.6 J moles of NaHCO3 .0642 .0642 ΔH (kJ/mol) -7.27448 kJ/mol -7.27448 kJ/mol Complete questions using data from table and the answer from question...
1. The standard enthalpy change for the combustion of mole of propane is -2043.0 kJ. CH_(g)...
1. The standard enthalpy change for the combustion of mole of propane is -2043.0 kJ. CH_(g) +5 0 (g) →3002(g) + 4H2O(g) Calculate Hº for propane based on the following standard molar enthalpies of formation. molecule CO (9) H2O(g) AH (kJ/mol-rxn) -393.5 -241.8 a. +1407.7 kJ/mol-rxn b. +104.7 kJ/mol-rxn c.-104.7 kJ/mol-rxn d -4190.7 kJ/mol-rxn e. -1407.7 kJ/mol-rxn 2. Which of the following statements is/are CORRECT? 1. If a reaction occurs at constant pressure, 4-AH. 2. The change in energy for...
1. Calculate the change in enthalpy for this reaction: 2C(s) + H2(g) → C2H2(g) Given the...
1. Calculate the change in enthalpy for this reaction: 2C(s) + H2(g) → C2H2(g) Given the following AHo -1299.5 kJ HP =-393.5 kJ HP -285.8 kJ CHI2(g) + (5/2)O2(g) → 2CO2(g) + H2O(1) C(s) + O2(g) → CO2(g) H2(g) + (12)O2(g) → H2O(1) A balloon contains 0.45 g of carbon dioxide and 0.6 grams of helium at 1.1 bar. If you compress the container to 80%ofits original volume, what will be the final pressure? Half a liter of water is...
10. What is a chemical reaction? A) when a liquid undergoes a phase change and produces a solid B) when a new element is formed by rearranging nucleons C) when two solids mix together to form a heterogeneous mixture D) when two liquids mix to form a homogeneous mixture E) when one or more new compounds are formed by rearranging atoms 17. Identify the reaction type: Al2O3(s) → O2(g) + Al(s) A) combustion B) combination C) decomposition D) single replacement...
2. Finding the temperature for a phase change. Ex: What is the normal boiling point of bromine? Br, (1) Br, (g)
Questions 1 - 5 s)
+ CO2 (g)
b. CO2 (s) → CO2 (g)
c. 4 C3H5N3O9(l) → 6 N2 (g) + 12 CO2 (g) +10 H2O (g) +O2
(g)
d. O2(g) + 2 H2 (g) → 2 H2O (g)
e. More than one correct answer present.
2. How much Lithium can be produced in 50.0 Amps is applied to
a molten LiBr for 43 minutes?
3. What is the standard electrochemical potential for an
electrochemical reaction (n=3) at 273.15...
Sodium hydroxide reacts with carbon dioxide as follows: 2 NaOH(s) + CO2(g) Na2CO3(s) + H2O(1) If 3.70 mol NaOH and 2.00 mol CO2 are allowed to react, how many moles of the excess reactant remains? 0.15 mol CO2 O 0.30 mol NaOH O 1.70 NaOH 1.00 mol CO2 How much energy is required to change the temperature of 1.50 L of water from 25.0 °C to 100.0 °C? The specific heat capacity of water is 4.184 J/g.°C; density H2O =...
1. The standard enthalpy change for the combustion of mole of propane is -2043.0 kJ. CH_(g) +5 0 (g) →3002(g) + 4H2O(g) Calculate Hº for propane based on the following standard molar enthalpies of formation. molecule CO (9) H2O(g) AH (kJ/mol-rxn) -393.5 -241.8 a. +1407.7 kJ/mol-rxn b. +104.7 kJ/mol-rxn c.-104.7 kJ/mol-rxn d -4190.7 kJ/mol-rxn e. -1407.7 kJ/mol-rxn 2. Which of the following statements is/are CORRECT? 1. If a reaction occurs at constant pressure, 4-AH. 2. The change in energy for...
1. Calculate the change in enthalpy for this reaction: 2C(s) + H2(g) → C2H2(g) Given the following AHo -1299.5 kJ HP =-393.5 kJ HP -285.8 kJ CHI2(g) + (5/2)O2(g) → 2CO2(g) + H2O(1) C(s) + O2(g) → CO2(g) H2(g) + (12)O2(g) → H2O(1) A balloon contains 0.45 g of carbon dioxide and 0.6 grams of helium at 1.1 bar. If you compress the container to 80%ofits original volume, what will be the final pressure? Half a liter of water is...
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