Get college assignment help at uniessay writers A standard solution is prepared for the analysis of fluoxymesterone (C20H29FO3), an anabolic steroid. A stock solution is first prepared by dissolving 14.0 mg of fluoxymesterone in enough water to give a total volume of 500.0 mL. A 100.0 µL aliquot (portion) of this solution is diluted to a final volume of 100.0 mL. Calculate the concentration of the final solution in terms of molarity. 1 M
Consider the titration of 30.0 mL of 0.025 M NH3 with 0.030 M HCl . Calculate the pH after the following volumes of titrant have been added. a) 20.0mL b) 24.0mL. c)25.0 mL. d) 26.0 mL
How many moles of cations are in 1.70 mol of K2SO4?
What is the molality of para-dichlorobenzene in a solution prepared by dissolving 2.55 in 55.0 benzene (d=0.879g/mL)?
Consider the dissolution of CaCl2. CaCl2(s) Ca2 (aq) 2 Cl-(aq) ΔH = -81.5 kJ A 12.0 g sample of CaCl2 is dissolved in 131 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the solution has a specific heat capacity of 4.18 J/°C·g.
what is the molarity of a HNO3 solution if 68.5 ml is needed to react with 250 ml of .150M KOH solution
A 31.0-g sample of water at 290. K is mixed with 51.0 g water at 310. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
what is the mass of CuBr2 is needed to prepare 750 ml of a 1.25M solution?
If 34 g of a solid of molar mass = 174 g/mol requires 21.3 kJ to melt it, what mathematical expression would be used to calculate the molar heat of fusion in kJ/mol?
Draw the skeletal structure of the major organic product formed from the following reactions. http://www.webassign.net/ksorgchem2/221-21-001g.jpg http://www.webassign.net/ksorgchem2/221-21-001b.jpg http://www.webassign.net/ksorgchem2/221-21-001d.jpg http://www.webassign.net/ksorgchem2/221-21-001h.jpg
Get college assignment help at uniessay writers Rank the following compounds in order of decreasing vapor pressure. Rank from highest to lowest vapor pressure. To rank items as equivalent, overlap them.
A student placed 18.5 of glucose in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.- mark on the neck of the flask was reached. The flask was then shaken until the solution was uniform. A 55.0- sample of this glucose solution was diluted to 0.500 . How many grams of glucose are in 100. of the final solution?
a student found that her mixture was 15% NH4CI, 20% NaCI, and 75% SiO2. assuming that her calculations are correct, what did she most likely do incorrectly in her experiment?
How many water molecules are in a block of ice containing 0.750 mol of water (rm H_2O)?
Consider the reaction: 2 K(s) 2 H2O(l) ® 2 KOH(aq) H2(g), DH = ? The heat released when 24.9g of K reacts with excess water is 124 kJ. Determine the enthalpy change, DH, for the above equation as written
1. a) Derive the reducible representation for the sigma-bonding set of ligand orbitals in the square planar [Pt(II)NH3]2 complex b) Find the irreducible representations of this ligand group orbitals and construct a sigma only Molecular Orbital diagram (Don’t think about the pi bonding) c) Label all levels with the appropriate symmetry designations d) Identify the frontier molecular orbitals e) Do you expect this complex ion to be colored? Why or why not? f) Assume the NH3 is replaced by four Cl- ligands. Qualitatively, what would happen to the frontier molecular orbitals (in terms of energy)? Would you expect to observe a blue or red shift? Explain your answer.
A calorimeter contains 23.0 of water at 12.0. When 2.20 of (a substance with a molar mass of 56.0 ) is added, it dissolves via the reaction and the temperature of the solution increases to 25.5. Calculate the enthalpy change, , for this reaction per mole of . Assume that the specific heat and density of the resulting solution are equal to those of water [4.18 and 1.00 ] and that no heat is lost to the calorimeter itself, nor to the surroundings.
which has the largest atomic radius: nitrogen”(N), antimony (Sb), or arsenic (As)? the smallest
When 12.0 g methane (CH4) and 41.4 g chlorine gas undergo a reaction that has an 80.0% yield, what mass of chloromethane (CH3Cl) forms? Hydrogen chloride also forms.
http://faculty.northseattle.edu/tfurutani/che101/lab5.pdf Look at that website. I am trying to answer the question: why was excess dry ice used in step 3? Thaaanks
a 100 L flask contains a mixture of methane, CH4, and argon at 25 C. The mass of argon present is 228 g and the mole fraction of methane in the mixture is 0.650. Calculate the total kinetic energy of the gaseous mixture.
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