Gold (Au, M = 197 .0 g mol-1) melts at 1338 K with a heat of...
Gold (Au, M = 197 .0 g mol-1) melts at 1338 K with a heat of fusion of 12. 7 kJ mol-1, and boils at 3080 K with a heat of vaporization of 310 kJ mol-1. The specific heats (in units J g-1 K-1) are: Au(s) - 0.131, Au(l) - 0.149, Au(g) - 0.0632. Calculate the heat needed to convert 2.15 g of solid gold at 1000 K to liquid at 1500 K.
- .
286 J
- B.
12.8 kJ
- C.
81.1 J
- D.
160 J
-
E. none of these
Homework Answers
Ethanol melts at 159K and boils at 351K. The enthalpy of fusion is 5.02 kJ/mol, the...
Ethanol melts at 159K and boils at 351K. The enthalpy of fusion is 5.02 kJ/mol, the enthalpy of vaporization is 35.56 kJ/mol, and the molar mass is 46.07 g/mol. The specific heats of solid ethanol is 0.97 J/g-K, for liquid ethanol it is 2.3 J/g-K, and for gaseous ethanol it is 1.9 J/g-K. How much heat (kJ) is needed to convert 215 g of liquid ethanol at 160 K to gaseous ethanol at 713 K?
A synthetic oil melts at 100 K, boils at 200 K, has a latent heat of...
A synthetic oil melts at 100 K, boils at 200 K, has a latent heat of fusion of 100 kJ/kg, a latent heat of vaporization of 1 MJ/kg, a solid specific heat of 1000 J/kgK, liquid specific heat of 2000 J/kgK, and vapor specific heat of 3000 J/kgK. Find the final state and temperature if 950 kJ of heat are added to 5 kg of the solid at 90 K.
Ethanol (C2H5OH) melts at -114 ∘C and boils at 78 ∘C. The enthalpy of fusion of...
Ethanol (C2H5OH) melts at -114 ∘C and boils at 78 ∘C. The enthalpy of fusion of ethanol is 5.02 kJ/mol, and its enthalpy of vaporization is 38.56 kJ/mol. The specific heat of solid and liquid ethanol are 0.97 J/g⋅K are 2.3 J/g⋅K respectively. A) How much heat is required to convert 30.5 g of ethanol at 30 ∘C to the vapor phase at 78 ∘C? Q=______kJ B)How much heat is required to convert 30.5 g of ethanol at -167 ∘C...
heat capacity of ?2?(?) 37.7 J/(mol⋅K) heat capacity of ?2?(?) 75.3 J/(mol⋅K) enthalpy of fusion of...
heat capacity of ?2?(?) 37.7 J/(mol⋅K) heat capacity of ?2?(?) 75.3 J/(mol⋅K) enthalpy of fusion of ?2? 6.01 kJ/mol Two 20.0‑g ice cubes at −14.0 °C are placed into 215 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts.
What is the entropy change to the surroundings when 1 mol of ice melts in someone's...
What is the entropy change to the surroundings when 1 mol of ice melts in someone's hand if the hand temperature is 32°C? Assume a final temperature for the water of 0°C. The heat of fusion of ice is 6.01 kJ/mol. a. -188 J/K b. -22.0 J/K c. -19.7 J/K d. +19.7 J/K e. +188 J/K
Given that the specific heat capacities of ice and steam are 2.06 J/g°C and 2.03 J/g°C,...
Given that the specific heat capacities of ice and steam are 2.06 J/g°C and 2.03 J/g°C, the molar heats of fusion and vaporization for water are 6.02 kJ/mol and 40.6 kJ/mol, respectively, and the specific heat capacity of water is 4.18 J/g°C, calculate the total quantity of heat evolved when 24.1 g of steam at 158°C is condensed, cooled, and frozen to ice at -50.°C.
Please help 1. Calculate the increase of entropy (in J/K) when 42 g of ice melts...
Please help 1. Calculate the increase of entropy (in J/K) when 42 g of ice melts at 0 ºC and 1 atm. (The heat of fusion for ice is 6,000 J/mol.) 2. Calculate the change in entropy (in J/K) when a 34.0 g of water is heated from 12.4 ºC to 70.5 ºC at 1 atm. (The specific heat is 4.184 J/(g-K).) Notice that entropy and heat capacity have the same units.
The heat of vaporization of CH_2CI_2 is 28.0 kJ/mol. Calculate the entropy the entropy change when...
The heat of vaporization of CH_2CI_2 is 28.0 kJ/mol. Calculate the entropy the entropy change when 42 g of CH_2CI_2 boils at its boiling point of 39.8degreeC. 17 J/K 44J/K 59J/K 350J/K 700J/K
1. Ice melts at 0C° with an enthalpy of fusion = 6.01 kJ mol-1 . An...
1. Ice melts at 0C° with an enthalpy of fusion = 6.01 kJ mol-1 . An ice cube with a mass of 20.0g is placed inside an incubator at 40.0C°. Determine the total entropy change (in J/K) of this system. 2. Calculate the total entropy change (in J/K) when 50.0 g of H2 gas initially in a tank at a pressure of 145 psi is withdrawn from the tank under a constant pressure of 23.0 psi at standard room temperature....
1. loe melts at 0C with an enthalpy of fusion -6.01 kJ mol". An ice cube...
1. loe melts at 0C with an enthalpy of fusion -6.01 kJ mol". An ice cube with a mass of 20.0g is placed inside an incubator at 40.0C°. Determine the total entropy change (in J/K) of this system.
The heat of vaporization of CH_2CI_2 is 28.0 kJ/mol. Calculate the entropy the entropy change when 42 g of CH_2CI_2 boils at its boiling point of 39.8degreeC. 17 J/K 44J/K 59J/K 350J/K 700J/K
1. loe melts at 0C with an enthalpy of fusion -6.01 kJ mol". An ice cube with a mass of 20.0g is placed inside an incubator at 40.0C°. Determine the total entropy change (in J/K) of this system.
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