How might the following errors affect the concentration of the standard 0.0600 M solution?
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In: Chemistry
Mass of Flask and foil (G)= 52.2997 Mass of Flask, foil, and condensed vapor(g) = 52.7528 Temp of boiling water bath= 99.8 degrees C Volume of flask =140.1(ml) Barometric pressure (mmhg)= 762.2 Room temp= 23.1 C Vapor at room temp(mmHg) = 100.0 mmhm 1. What is uncorrected mass of condensed vapor (g)? 2. Corrected density of air(g/l) 3. Average volume of flask (g)? 4. Initial mass of air in flask(g)? 5. Final Partial Pressure of air in flask? 6. Final Mass of air in flask? 7. Mass of air lost? 8. Corrected mass of condensed vapor(g) 9. Molecular weight(g/mol) 10. Average molecular weight (g/mol) 11. Average deviation(g/mol)
In: Chemistry
a) Calculate the cell potential at 25°C for the cell
Fe(s) I (Fe2+ (0.100 M) II Pd2+ (1.0 × 10-5 M) I Pd(s)
given that the standard reduction potential for Fe2+/Fe is -0.45 V and for Pd2+/Pd is +0.95 V. - Please show the steps
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b) Based on the half-reactions and their respective standard reduction potentials below, the strongest reducing agent is ________, and the strongest oxidizing agent is ________. Ag+ (aq) + e- → Ag(s) 0.80 V 2 H+ (aq) + 2 e- → H2 (g) 0.00 V Cd2+ (aq) + 2 e- → Cd(s) -0.40 V The answer is Cd, Ag+ Can you please explain to me why this is the right answer. |
In: Chemistry
Argon at 400 K and 50 bar is adiabatically and reversibly expanded to 1 bar through a turbine in a steady process. Compute the outlet temperature and work derived per mole.
In: Chemistry
Calculate the pH of a mixture that contains 0.23 M of HCOOH and 0.20 M of HC6H5O. The Ka of HCOOH is 1.8
In: Chemistry
Which the following statements about Histidine are true?
The shape around the N of the NH2 group (N1) is trigonal planar.
There are 6 pi bonds in Histidine.The C-C-O bond angle around the C-O double bond (C2-C9-O11 angle) is greater than 120o.
The shape around the carbon of the C-O double bond (C9) is trigonal planar
.There are 4 sp2 hybridized carbon atoms in Histidine.
The N-H bond in the ring of atoms (N6-H18) is lying in the same plane as the ring, therefore this must be an sp3 hybridized N.
There are 19 sigma bonds in Histidine.
In: Chemistry
A sample of carbonic acid (0.125 L, 0.154 M, pKa1 = 6.35, pKa2 = 10.33) was titrated with 1.53 M NaOH. Calculate the pH at the first and at the second midpoints.
In: Chemistry
In: Chemistry
A 15.2% (m/v) solution of sodium chloride (NaCl) is used to prepare 25.0 L of a physiological saline solution with a concentration of 0.154 M NaCl. What volume of the 15.2% (m/V) solution of sodium chloride would be required to make 25.0 L of the physiological saline solution ( 0.154 M NaCl) ?
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1) Calculate the maximum wavelength of radiation (corresponding to the minimum energy) necessary to eject a 1s electron from a 27Al atom (which has a 1s1s binding energy of 1559.6 eVeV).
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The average kinetic energy of the molecules in a gas sample depends only on the temperature, T. But given the same kinetic energies, a lighter molecule will move faster than a heavier molecule. What is the rms speed of Cl2 molecules at 347 K? What is the rms speed of He atoms at 347 K?
In: Chemistry
Elemental S reacts with O2 to form SO3 according to the reaction:
2S+ 3O2--> 2SO3
a.) How many molecules are needed to react with 5.74g of S? Express your answer numerically in units of molecules.
b.) What is the theoretical yield of SO3 produced by 5.74 g of S? Express your answer numerically in grams.
Next, consider a situation in which all of the S is consumed before all of the O2 reacts, or one in which you have excess S because all of the O2 has been used up.
c.) For each of the given situations, indicate whether S or O2 is the limiting reactant. Drag each item to the appropriate bin.
Bins: Limiting reactant is sulfur, and Limiting reactant is oxygen
Choices:
- 3.0 mol sulfur, 4.0 mol of oxygen
- 3.0 mol sulfur, 3.0 mol oxygen
-3.0 mol sulfur, 5.0 mol oxygen
In: Chemistry
Consider the following reversible Hetererogenes reaction:
C(s) + CO2(g) -><- 2CO(g)
When equalibrium is reached at a certain point the total pressure of the system is found to be 4.98 atm. If the equilibrium constant Kp for this reaction is equal to 1.67 at this temperature, calculate the equilibrium partial pressures of CO2 and CO gases?
P(CO)eq= ? P(CO2)eq=?
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Discuss the physical appearance of the aqueous tea solution versus the o¬rganic solution; why is tea so dark?
In: Chemistry
1.) A can of soft drink consists of CO2 dissolved in water and a vapor space filled with CO2 and H2O vapor. Your goal is to find the mole fraction of CO2 in the liquid mixture at 2 bar and 17 C.
a.) Write down the equation that describes the vapor-liquid equilibria for water-vapor in this system and name the variables involved
b.) Write down the equation that describes the vapor-liquid equilibria for CO2 in this system and name the variables involved
c.) What is the Psat of water-vapor at these conditions?
d.) If the Henry’s constant for CO2 at this temperature is 1280 bars, what is the mole fraction of CO2 in the liquid mixture?
e.) What is the Antoine’s equation? What happens to the Psat of a substance as the temperature increases? Explain the behavior in your own words.
In: Chemistry