Ethanol is commonly referred to simply as alcohol or spirits, It is the principal type of alcohol found in alcoholic beverages. It is a psychoactive drug and one of the oldest recreational drugs used by humans. It can cause alcohol intoxication when consumed in sufficient quantity. It is a volatile, flammable, colorless liquid with the structural formula CH3CH2OH. The density of an aqueous solution containing 45 weight percent ethanol is 0.92472 g/mL.
a) A person weighing 75 kg takes a swallow of an alcoholic beverage corresponding to 25 gram of pure ethanol. It is assumed that the alcohol mixes evenly in person´s water phase, constituting 62 % of the person´s weight. Calculate the person´s ethanol mass per mille (alkoholpromille in Danish).
b) The vapor pressures of ethanol (C2H5OH) and 1-propanol (C3H7OH) at 35 oC are 100.0 mmHg and 37.6 mmHg, respectively. Assume ideal behaviour and calculate the partial pressures of ethanol and 1-propanol at 35 oC over a solution of ethanol in 1- propanol, in which the mole fraction of ethanol is 0.200.
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Nitrous acid has a Ka of 4.0x10-4. Calculate the pH when 40.00 mL of 0.125 M HNO2 is titrated against 0.200 M NaOH and reaches the equivalence point.
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Which has the highest Zeff for its valence electron?
A) He
B) Si
C) K
D) H
And why?
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generate a titration curve from the information provided: your titrand is 48.0 mL of 0.500 M lactic acid and you will be titrating with 1.0 M KOH.
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Balance the following redox equations by the ion-electron half-reaction method: (a) (acid solution): ClO3 – + I– → I2 + Cl- (b) (acid solution): Cr2O7 2– + U4+ → Cr3+ + UO2 2+ (c) (basic solution): Cr3+ + Cl2 (g) → CrO4 2– + Cl–
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How many grams of aluminum sulfite will be formed from 125mL of a 0.25 M solution of sulfurous acid. Complete this question by ansering the following:
a ) How many moles of sulfurous acid are present in 125 mL of a 0.25M solution?
b) What is the molar ratio of sulfurous acid to aluminum sulfite?
c) How many moles of aluminum sulfite will be produced?
d) What is the molar mass of aluminum sulfite?
e) How many frams of aluminum sulfite will be produced?
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How much heat is evolved in converting 1.00 mol of steam at 130.0 ∘C to ice at -50.0 ∘C? The heat capacity of steam is 2.01 J/(g⋅∘C) and of ice is 2.09 J/(g⋅∘C).
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How might the following errors affect the concentration of the standard 0.0600 M solution?
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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)
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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. |
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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.
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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
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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.
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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.
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