Heating Curve
How much energy is required to heat 125.0 g of water from −15.0 °C to 35.0 °C?
C of ice is 2.09 J/g˚C and C of water is 4.18 J/g˚C
∆Hfus of water is 6.02 kJ/mol
Q = 64.0 kJ
Determine the final temperature when a 25.0 g piece of iron at 85.0 °C is placed into 75.0 grams of water at 20.0 °C.
C for iron is 0.45 J/g˚C
Calculate the enthapy for the following reaction:
N2(g) + 2O2(g) ---> 2NO2(g)ΔH° = ??? kJ
Using the following two equations:
N2(g) + O2(g) ---> 2NO(g) ΔH° = +180 kJ
2NO2(g) ---> 2NO(g) + O2(g) ΔH° = +112 kJ
+68 kJ
How many Joules of energy are contained in a photon with λ = 550 nm? How many kJ/mol of energy is this?
217.6 kJ/mol
A hydrogen atom has n = 5 and mℓ = −2. What are the possible values for ℓ in this orbital?
0, 1, 2, 3, and 4
A 10.35 kg block of ice has a temperature of −22.3 °C. The block absorbs 4.696 x 106 J of heat. What is the final temperature of the liquid water?
C of ice is 2.09 J/g˚C and C of water is 4.18 J/g˚C
∆Hfus of water is 6.02 kJ/mol
17.5 ˚C
Determine the final temperature when 10.0 g of aluminum at 130.0 °C mixes with 200.0 grams of water at 25.0 °C.
C for aluminium is 0.901 J/g˚C
26.12˚C
Use the following data to determine the enthalpy (ΔH°) of reaction for:
NO2(g) + 7⁄2H2(g) ---> 2H2O(ℓ) + NH3(g) ΔH° = ??? kJ
Using the following two equations:
2NH3(g) ---> N2(g) + 3H2(g). ΔH° = +92 kJ
1⁄2N2(g) + 2H2O(ℓ) ---> NO2(g) + 2H2(g).ΔH° = +170 kJ
-216 kJ
How many kJ/mol (remember: mol means mole of photons) of energy is contained in light with a wavelength of 496.36 nm?
241 kJ/mol
Which of the following is a possible set of quantum numbers in an atom?
(a) 3, 2, −1, +1
(b) 3, 3, −1, +1⁄2
(c) 3, 1, −2, −1⁄2
(d) 3, 1, 0, +1⁄2
D
Bromine melts at -7.25˚C and boils at 58.8˚C. The enthalpy of fusion of bromine is 10.57 kJ/mol and the enthalpy of vaporization of bromine is 29.96 kJ/mol. The specific heat of liquid bromine is 0.474 J/g*K. How much heat, in kJ, is required to convert 25.0 g of solid bromine at -7.25˚C to the gas phase at 58.8˚C? Molar mass of bromine (Br2) is 159.8 g/mol
7.12 kJ
Determine the final temperature when 20.0 g of mercury at 165.0 °C mixes with 200.0 grams of water at 60.0 °C.
C for Mercury is 0.14 J/g˚C
60.35˚C
During discharge of a lead-acid storage battery, the following chemical reaction takes place:
Pb + PbO2 + 2H2SO4 ---> 2PbSO4 + 2H2O
Using the following two reactions:
(1) Pb + PbO2 + 2SO3 ---> 2PbSO4. ΔH° = −775 kJ
(2) SO3 + H2O ---> H2SO4. ΔH° = −113 kJ
Determine the enthalpy of reaction for the discharge reaction above.
-549 kJ
What is the energy of a photon of green light with a frequency of 5.76 x 1014 s¯1.
3.82 x 10^-19 J
Determine which set(s) of quantum numbers is NOT allowed:
(a) n = 5, ℓ = 3, mℓ = −1, ms = +1⁄2
(b) n = 1, ℓ = 0, mℓ = 0, ms = −1⁄2
(c) n = 2, ℓ = 2, mℓ = 2, ms = +1⁄2
(d) n = 4, ℓ = 1, mℓ = 0, ms = −1⁄2
(e) n = 6, ℓ = 4, mℓ = −3, ms = +1⁄2
C