Homework Answers
1)
molar heat of solution = +25.7 kJ/mol
mass of water = 55.0 g
mass of NH4NO3 = 3.0 g
moles of NH4NO3 = 3.0 / 80.04 = 0.0375 mol
delta H = - Q / n
25.7 = - Q / 0.0375
Q = - 0.963 kJ = 963 kJ
Q = m Cp dT
963 = - 55 x 4.184 x (Tf - 22.9)
Tf = 18.7 oC
final temperature = 18.7 oC
Add Answer to:
Prelab: 1. The molar heat of solution of ammonium nitrate is +25.7 kJ/mol. Assuming the specific heat of the resulting...
Question 3 1 pts The heat of solution of ammonium nitrate is 26.2 kJ/mol. When ammonium...
Question 3 1 pts The heat of solution of ammonium nitrate is 26.2 kJ/mol. When ammonium nitrate solid is dissolved in water at room temperature the beaker containing the solution will start out getting colder, but will soon get very hot will likely feel warm to the touch will likely feel cold to the touch will need to be large enough to hold the extra heat. No transfer to heat
The change in enthalpy for dissolving ammonium nitrate in water is 26 kJ/mol. Determine the amount...
The change in enthalpy for dissolving ammonium nitrate in water is 26 kJ/mol. Determine the amount of ammonium nitrate (in grams) that was dissolved in water to make 50.0 mL of solution if the temperature of a coffee cup calorimeter changes from 25.3°C to 21.5°C. Assume the density of the solution is 1.0 g/mL and the heat capacity of the solution is 4.2 J/g°C.
5.876 g of ammonium nitrate (M.W. 80.043 g/mol) was added to a calorimeter containing 99.270 g...
5.876 g of ammonium nitrate (M.W. 80.043 g/mol) was added to a calorimeter containing 99.270 g of water at 24.5 °C. After the NH4NO3 dissolved the final temperature reached was 20.0°C. Calculate 4sys for the dissolution of NH4NO3 The specific heat of water is 4.184 Jg-toc- and the heat capacity of the calorimeter (the "B" constant) is 15.0 J°C-.
5.876 g of ammonium nitrate (M.W. 80.043 g/mol) was added to a calorimeter containing 99.270 g...
5.876 g of ammonium nitrate (M.W. 80.043 g/mol) was added to a calorimeter containing 99.270 g of water at 24.5 °C. After the NH4NO3 dissolved the final temperature reached was 20.0 °C. Calculate sys for the dissolution of NH4NO3 The specific heat of water is 4.184 Jg-loc-1 and the heat capacity of the calorimeter (the "B" constant) is 15.0°C-1
Compound Δ Hrxn (kJ/mol) NH4NO3 + 25.7 KCl + 17.2 NaOH -44.5 KOH -57.6 You are...
Compound Δ Hrxn (kJ/mol) NH4NO3 + 25.7 KCl + 17.2 NaOH -44.5 KOH -57.6 You are given 6.9 grams of an unknown salt. You dissolve it in 56.5 mL of water. As the salt dissolves, the temperature of the solution changes from an initial temperature of 28.9°C to a final temperature of 22.9°C. Based on the chart of ΔH values and the temperature change, you can determine which salt you have. What is the temperature change? Δ T = o C...
When a 5.26-g sample of solid ammonium nitrate dissolves in 52.5 g of water in a...
When a 5.26-g sample of solid ammonium nitrate dissolves in 52.5
g of water in a coffee-cup calorimeter (see above figure) the
temperature falls from 24.00 oC to 17.20 oC.
Calculate H in kJ/mol NH4NO3 for
the solution process.
NH4NO3(s)
NH4+(aq) + NO3-(aq)
The specific heat of water is 4.18 J/g-K.
Hsolution = _________kJ/mol
NH4NO3.
Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and...
Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction: NH4NO3(s) → NH(aq) + NO3 (aq) In order to measure the enthalpy change for this reaction, 1.25 g of NH4NO3 is dissolved in enough water to make 25.0 mL of solution. The initial temperature is 25.8 °C and the final temperature (after...
When a 4.25 g sample of solid ammonium nitrate dissolves in 60.0 g of water in a coffee-cup calorimeter, the temperatur...
When a 4.25 g sample of solid ammonium nitrate dissolves in 60.0 g of water in a coffee-cup calorimeter, the temperature drops from 22.0 degrees C to 16.9 degrees C. Calculate Delta H kJ/mol NH4NO3 for the solution process NH4NO3 ( s) yields NH4 (there is a plus sign above the four)(aq) + ^ + NO3(negative sign above the three) (aq) Assume that the specific heat of the solution is the same as that of pure water. Express your answer...
Heat Flow and Calorimetry Prelab Questions Section: Name: 1. Prepare for It! Prelab Question A A...
Heat Flow and Calorimetry Prelab Questions Section: Name: 1. Prepare for It! Prelab Question A A 235.0 g sample of metal is heated to 100.0C and poured into a calorimeter containing 50.0 g of water at 20.5°c. The equilibrium temperature of the water and metal is 30.5 C. Using the specific heat of water, 4.18 J/goC, determine the specific heat of the metal from equation 3. Use equation 5 to find the approximate molar mass of the metal. Show your...
A coffee cup calorimeter is prepared, containing 100.000 g of water (specific heat capacity = 4.184...
A coffee cup calorimeter is prepared, containing 100.000 g of water (specific heat capacity = 4.184 J/g K) at initial temperature 80.000 C. A salt weighing 5.451 g is quickly added. The salt has a molar mass of 124.742 g/mol. The final temperature of the solution is 73.937 C. Assume no heat loss to the surroundings. Assume the specific heat capacity of the solution is equal to that of pure water, and that the mass of the solution is equal...
Question 3 1 pts The heat of solution of ammonium nitrate is 26.2 kJ/mol. When ammonium nitrate solid is dissolved in water at room temperature the beaker containing the solution will start out getting colder, but will soon get very hot will likely feel warm to the touch will likely feel cold to the touch will need to be large enough to hold the extra heat. No transfer to heat
5.876 g of ammonium nitrate (M.W. 80.043 g/mol) was added to a calorimeter containing 99.270 g of water at 24.5 °C. After the NH4NO3 dissolved the final temperature reached was 20.0°C. Calculate 4sys for the dissolution of NH4NO3 The specific heat of water is 4.184 Jg-toc- and the heat capacity of the calorimeter (the "B" constant) is 15.0 J°C-.
5.876 g of ammonium nitrate (M.W. 80.043 g/mol) was added to a calorimeter containing 99.270 g of water at 24.5 °C. After the NH4NO3 dissolved the final temperature reached was 20.0 °C. Calculate sys for the dissolution of NH4NO3 The specific heat of water is 4.184 Jg-loc-1 and the heat capacity of the calorimeter (the "B" constant) is 15.0°C-1
When a 5.26-g sample of solid ammonium nitrate dissolves in 52.5
g of water in a coffee-cup calorimeter (see above figure) the
temperature falls from 24.00 oC to 17.20 oC.
Calculate H in kJ/mol NH4NO3 for
the solution process.
NH4NO3(s)
NH4+(aq) + NO3-(aq)
The specific heat of water is 4.18 J/g-K.
Hsolution = _________kJ/mol
NH4NO3.
Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction: NH4NO3(s) → NH(aq) + NO3 (aq) In order to measure the enthalpy change for this reaction, 1.25 g of NH4NO3 is dissolved in enough water to make 25.0 mL of solution. The initial temperature is 25.8 °C and the final temperature (after...
Heat Flow and Calorimetry Prelab Questions Section: Name: 1. Prepare for It! Prelab Question A A 235.0 g sample of metal is heated to 100.0C and poured into a calorimeter containing 50.0 g of water at 20.5°c. The equilibrium temperature of the water and metal is 30.5 C. Using the specific heat of water, 4.18 J/goC, determine the specific heat of the metal from equation 3. Use equation 5 to find the approximate molar mass of the metal. Show your...
Most questions answered within 3 hours.
-
What mechanisms Drive speciation??
(I.e. what was Dawins theory on the orgin of species, and how...
asked 22 minutes ago -
The manager at a car assembly plant believes that the mean
assembly time for a car...
asked 1 hour ago -
Which of the following is true of electron capture?
A) It decreases the nuclide's mass number...
asked 2 hours ago -
Assuming an efficiency of 43.10%, calculate the actual yield of
magnesium nitrate formed from 114.9 g...
asked 3 hours ago -
The highly pathogenic bacterium Clostridium
perfringens causes gangrene, a disease that results in the
destruction of...
asked 5 hours ago -
In the context of situation analysis, which of the following is
a category for analysis in...
asked 5 hours ago -
In a study of the gas phase decomposition of sulfuryl chloride
at 600 K SO2Cl2(g)SO2(g) +...
asked 5 hours ago -
75 g of 2-propanol (C3H8O) and 25 g of pentane are mixed in a
200 mL...
asked 5 hours ago -
The 2800-turn coil in a dc motor has an area per turn of 1.1 ×
10-2...
asked 5 hours ago -
Draw a combinational logic circuit diagram with a symbol inside
the box for two I/P of...
asked 5 hours ago -
The cliché we use quite a lot in finance is: there is a need to
maximize...
asked 5 hours ago -
In class we discussed the addition of HCl to alpha pinene. Would
you expect one or...
asked 5 hours ago