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Physical Chemistry
Hi
I have a mixture of 2 volatile liquids.
How can I calculate the concentration of each component in the gas phase in equilibrium?
Thanks in advance
I have a mixture of 2 volatile liquids.
How can I calculate the concentration of each component in the gas phase in equilibrium?
Thanks in advance
Physical Chemistry
Mothballs are composed primarily of the hydrocarbon naphthalene (C10H8). When 1.025 g of naphthalene is burned in a bomb calorimeter, the temperature rises from 24.25 ∘C to 32.33 ∘C.
Find ΔErxn for the combustion of naphthalene. The heat capacity of the calorimeter, determined in a separate experiment, is 5.11kJ/∘C.
Find ΔErxn for the combustion of naphthalene. The heat capacity of the calorimeter, determined in a separate experiment, is 5.11kJ/∘C.
Physical Chemistry
What is the criteria for a complex to act as reducing or oxidising agent
Physical Chemistry
1. Activities
a.) The activity of a pure substance in the reference state is a = 1. With this in mind,
calculate the activity for liquid water at 25C for pressures of 10 bar and 100 bar,
assuming that the molar volume is constant. (4 credits)
b.) Consider two solutions whose solute activities are aB’ and aB”, referred to the
standard state. Show that the difference in the chemical potentials of these two
solutions is independent of the standard state and depends only on the ratio aB’/aB”.
(2 credits)
c.) An aqueous solution of NaCl has a molality of 0.315 molkg-1. At what molality will
an aqueous solution of K2SO4 have the same ionic strength? (3 credits)
a.) The activity of a pure substance in the reference state is a = 1. With this in mind,
calculate the activity for liquid water at 25C for pressures of 10 bar and 100 bar,
assuming that the molar volume is constant. (4 credits)
b.) Consider two solutions whose solute activities are aB’ and aB”, referred to the
standard state. Show that the difference in the chemical potentials of these two
solutions is independent of the standard state and depends only on the ratio aB’/aB”.
(2 credits)
c.) An aqueous solution of NaCl has a molality of 0.315 molkg-1. At what molality will
an aqueous solution of K2SO4 have the same ionic strength? (3 credits)
Physical Chemistry
Describe how oxidation and reduction involve electrons, change oxidation numbers, and combine in oxidation-reduction reactions.
Physical Chemistry
Consider the isomerization equlibria of an alkene (C4H8) that co-exists as three isomers.
Reaction 1: cis-2-butene ⇔ trans-2-butene
Reaction 2: cis-2-butene ⇔ 2-methylpropene
Reaction 3: trans-2-butene ⇔ 2-methylpropene
Known values at 300k are:
cis-2-butene: standard G of formation = 66kJ/mol
Standard enthalpy of formation = -7.0kJ/mol
trans-2-butene: standard G of formation = 63kJ/mol
Standard enthalpy of formation = -11.2kJ/mol
2-methylpropene: standard G of formation =58.0kJ/mol
Standard enthalpy of formation = not known
The temperature of the above system is raised to 400K and equilibrium is re-established. The mole percentage of trans-2-butene at the new equilibrium is determined to be 18%. Calculate the enthalpy of formation and the entropy of formation for reactions 2 and 3
Reaction 1: cis-2-butene ⇔ trans-2-butene
Reaction 2: cis-2-butene ⇔ 2-methylpropene
Reaction 3: trans-2-butene ⇔ 2-methylpropene
Known values at 300k are:
cis-2-butene: standard G of formation = 66kJ/mol
Standard enthalpy of formation = -7.0kJ/mol
trans-2-butene: standard G of formation = 63kJ/mol
Standard enthalpy of formation = -11.2kJ/mol
2-methylpropene: standard G of formation =58.0kJ/mol
Standard enthalpy of formation = not known
The temperature of the above system is raised to 400K and equilibrium is re-established. The mole percentage of trans-2-butene at the new equilibrium is determined to be 18%. Calculate the enthalpy of formation and the entropy of formation for reactions 2 and 3
Physical Chemistry
The work function for lithium is 297.7kj/mol. What is the maximum wavelenght of light that can remove an electron form an atom on the surface of lithium metal ?
Physical Chemistry
Which colour appears the most in chemical substances ? Which one is "The most popular" ?
Physical Chemistry
sir
why the capillary tube in the liquid rise and in the glass tube the liquid are not rise plz give me the reson of this question
why the capillary tube in the liquid rise and in the glass tube the liquid are not rise plz give me the reson of this question
Physical Chemistry
100 ml of 0.5 M hydrazoic acid (N3H Ka = 3.6 × 10–4 ) and 400 ml of 0.1 M cyanic acid (HOCN1 Ka = 8 × 10–4) are mixed. Find h+ and n3-
concentration
concentration
