Calculate the vapour pressure lowering of a 1M aqueous sucrose (sugar) solution at 25 oC where po(H2O) = 23 mm Hg. The density of 1M sucrose at 25 oC is 1.129 g/mL.

The answer to this question is 0.51 mm Hg

Can you please explain how ti find this?

We know that vapour pressure lowering is DeltaP = X_b * P_A

but how do i find the mole fraction?

Can some one please explain this in detail

Thank you

1) When the Ag⁺ concentration is 1.08 M, the observed cell potential at 298K for an electrochemical cell with the following reaction is 1.654V. What is the Zn²⁺ concentration?

2Ag⁺(aq) + Zn(s) > 2Ag(s) + Zn²⁺(aq)

Answer: ___ M

2) A concentration cell similar to the one shown is composed of two Cr electrodes and solutions of different Cr³⁺concentrations. The left compartment contains 1.32 M Cr³⁺, and the right compartment contains 0.250 M Cr³⁺.


Calculate the cell potential for this reaction at 298 K.

____ volts

In this chromium concentration cell, the compartment on the left is the __anode or cathode__, and the compartment on the right is the _anode or cathode__.

2. How is glycogen breakdown and synthesis regulated in the liver by glucagon and insulin? (Are the processes increased or decreased by these hormones?)

What is the calculated value of the cell potential at 298K for an electrochemical cell with the following reaction, when the Ag+ concentration is 1.49 M and the Al3+ concentration is 3.15×10-4 M ? 3Ag+(aq) + Al(s)3Ag(s) + Al3+(aq)

Answer: in V

The cell reaction as written above is spontaneous for the concentrations given: True or False

What is the calculated value of the cell potential at 298K for an electrochemical cell with the following reaction, when the Ag+ concentration is 5.75×10-4 M and the Mn2+ concentration is 1.24 M ? 2Ag+(aq) + Mn(s)2Ag(s) + Mn2+(aq)

Answer: in V

The cell reaction as written above is spontaneous for the concentrations given: True or False

What is the calculated value of the cell potential at 298K for an electrochemical cell with the following reaction, when the Ag+ concentration is 1.88×10-4 M and the Cr3+ concentration is 1.32 M ? 3Ag+(aq) + Cr(s)3Ag(s) + Cr3+(aq)

Answer: in V The cell reaction as written above is spontaneous for the concentrations given: True or False?

Thank you so much!

cA) [Mn(H₂O)₆]³⁺ (sp³d² octahedral)

B) [Mn(NO₂)₆]^3- (d²sp³ octahedral)

C) [Ni(CN)₄]^2- (square planar)

Please outline only the main steps of an efficient column chromatographic separation of a non-polar compound A from a medium polar compound B and a non-polar chemical (C). C is slightly less polar than A.

explain the difference in properties of diamond and graphite.

-why is graphite black while diamond is not?

-why is graphite very conductive while diamond is not a good conductor of electricity?

-why is graphite soft while diamond is hard

Answer the following questions for the transition metal complex [Mn(CN)₆]^3-.

Using sigma-only considerations:

a) Draw the 5 d orbitals associated with the transition metal center and state whether each one will overlap (strongly, weakly, or not at all) with the ligands (assume sigma bonding only).

b) Using your answer from (a), draw and label the energy levels of the d orbitals (i.e. the d orbital splitting diagram).

c) Fill in the correct number of electrons. Decide whether the complex should be high spin or low spin.

d) Determine the spin state (S) and multiplicity (singlet, triplet, doublet, etc) of the complex.

e) State whether the ligands are pi-donors or pi-acceptors.

f) Draw the 5 d orbitals associated with the transition metal center and state whether each one will overlap (strongly, weakly, or not at all) with the pi-system of the ligands (state whether the ligands are pi-donors or pi-acceptors). Show the pi-overlap in your drawings.

g) Show and discuss the effect that these pi-interactions will have on the d-orbital splitting diagram you drew above.

h) Based on your d orbital splitting diagrams, state whether electronic distortions from ideal geometry are expected and describe how the geometry might distort. Draw the resulting d orbital splitting diagram.

How to explain the basic principles, instrument operation and the application of Microwave Induced Plasma - Atomic Emission Spectrometry (MIP-AES)?

Ethylene glycol, formula C2H6O2, is used as antifreeze for automobiles and is sometimes mixed with water at a 1:1 ratio by volume and produces a solution with a density of 1.07 g/mL. Assume that the solution behaves ideally. Notes: at 25 oC the densities of water and ethylene glycol are 1.00 g/mL and 1.11 g/mL, respectively, the vapor pressures of water and ethylene glycol at 20 oC are 17.54 torr and 0.06 torr, respectively, and Kb and Kf of water are 0.51 K/m and 1.86 K/m, respectively.

a. What is the freezing point of this solution?

b. What is the vapor pressure, in torr, of this solution at 20 oC?

c. What is the osmotic pressure, in atm, of this solution at 25 oC and 0 oC?

d. What is the mass percent (m/m)% of this solution?

The ability of an atom in a molecule to pull bonding electrons toward itself is:

a)Paramagnetism

b)Diamagnetism

c)Effective nuclear charge

d)Electronegativity

e)Ionization potential

Given the electronegativity values below, select the single bond that is LEAST polar.

Element: H C N O

Electronegativity: 2.1 2.4 3.0 3.5

a) N-H

b) C-H

c) O-N

d) O-C

e) O-H

Imagine that you grew a shiny crystal of a brand new compound X. How would you determine: (a) the crystal structure of X (b) whether this material is a semiconductor or not

Balance the skeleton redox reaction. Write the oxidation state of each compound above the redox symbol, show each redox couple/half reaction. Show both the acidic and basic state. The answer must demonstrate the use of the half reaction method. H5IO6 (aq) + I2 (aq) → IO3 - (aq)