04/20/20

Combustion Analysis: Empirical and Molecular Formulas
1) When 4.468 grams of a hydrocarbon, CxHy, were burned in a combustion analysis apparatus, 14.54 grams of CO2 and 4.465 grams of H2O were produced.In a separate experiment, the molar mass of the... more
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04/20/20

Write the net ionic equation for 2Li₃PO₄ (aq) + 3Pb(NO₃)₂ (aq) -> 6LiNO₃ (aq) + Pb₃(PO₄)₂ (s)
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04/20/20

What volume of oxygen gas is need for the complete combustion of 6.0 L of propane gas?
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04/20/20

Acid and base equilibrium
OS Chapter 14 Acids and Bases Buffers and Titrations Items Determine the ammonia concentration of an aqueous solution that has a pH of 11. 00. The pKb of NH3 is 4.75. Show work.
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04/20/20

Compare the solubility of silver chromate in each of the following aqueous solutions:
Compare the solubility of silver chromate in each of the following aqueous solutions: Clear All 0.10 M KNO3 0.10 M NH4CH3COO 0.10 M K2CrO4 0.10 M AgCH3COO More soluble than in pure... more
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04/20/20

The maximum amount of silver chloride that will dissolve in a 0.104 M silver nitrate solution is

The maximum amount of silver chloride that will dissolve in a 0.104 M silver nitrate solution is  ____ M.
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04/20/20

Calculate the solubility of CaCO3 (a) in pure water and (b) in a solution in which [(NH4)2CO3] = 0.216 M.
Calculate the solubility of CaCO3 (a) in pure water and (b) in a solution in which [(NH4)2CO3] = 0.216 M. Solubility in pure water =      M Solubility in 0.216 M  (NH4)2CO3 =     M
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04/20/20

Solid sodium carbonate is slowly added to 75.0 mL of a 0.0611 M lead acetate solution. The concentration of carbonate ion required to just initiate precipitation is

Solid sodium carbonate is slowly added to 75.0 mL of a 0.0611 M lead acetate solution. The concentration of carbonate ion required to just initiate precipitation is _____ M.
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04/20/20

The solubility of Fe2S3 is measured and found to be 2.16×10-16 g/L. Use this information to calculate a Ksp value for iron(III) sulfide.

The solubility of Fe2S3 is measured and found to be 2.16×10-16 g/L. Use this information to calculate a Ksp value for iron(III) sulfide.Ksp = 
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04/20/20

What volume of Hclo4
what volume in mL of 9.2M Hclo4 would be required to make 500 mL of a solution with a pH of 3.20
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04/20/20

What is the rate constant (in min -1) for the decay of this radionuclide?
Consider the following data for a particular radionuclide: Time (min) Nt (g)0 1.233 1.156 1.089 1.0112 0.940What... more
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04/20/20

Y-95 undergoes beta decay. What is the product nucleus?
Y-95 undergoes beta decay. What is the product nucleus?The correct answer Zr-95
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04/20/20

Th-234 undergoes beta decay. What is the product nucleus?

Th-234 undergoes beta decay. What is the product nucleus? The correct answer is Pa-234
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04/20/20

Chemistry | Chapter 10 Test Question
A sample of liquid releases 60.5 kJ when it freezes. If the liquid has a molar heat of fusion of 2.642 kJ/mol, how many moles of the liquid were present?
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04/20/20

Chemistry Test Enthalpies
Using data from Appendix C, determine the standard free-energy change ΔGo at 25oC for the following reaction:FeCl2(s)⇌Fe2+(aq)   +   2Cl−(aq)Report answer in kJ to 3 sig figsProvide your answer below: more
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04/20/20

Write the net ionic equation and list the spectators for the reaction KF (aq) + HgNO3 (aq) 
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04/19/20

300 cm3 of water is added to a solution of 200 cm3 of 0.50 mol dm–3 sodium chloride. Calculate the concentration of sodium chloride in the new solution.
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04/19/20

If you had 4.34 x 10^24 formula units of NaBr how many moles would you have
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04/19/20

chemtisty-calorimetry
A total of 2.00  of a compound is allowed to react with water in a foam coffee cup and the reaction produces 181  of solution. The reaction caused the temperature of the solution to rise from... more
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04/19/20

What volume does four mol occupy at STP?
What volume does four mol occupy at STP?
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04/18/20

How many moles of electrons are required to produce 31.3 g of potassium metal from a sample of molten potassium chloride?
How many moles of electrons are required to produce 31.3 g of potassium metal from a sample of molten potassium chloride?The correct answer is 0.801
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04/18/20

Calculate {Cd2+} when {Al3+} = 0.57 M and Ecell = 1.22 V.
A voltaic cell consists of an Al/Al3+ half-cell and a Cd/Cd2+ half-cell. Calculate {Cd2+} when {Al3+} = 0.57 M and Ecell = 1.22 V. Use reduction potential values of Al3+ = -1.66 V and for Cd2+ =... more
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04/18/20

Calculate Ecell when conc. of Ni2+ = 0.078 M and of Co2+ = 0.492 M.
A voltaic cell consists of an Ni/Ni2+ half-cell and a Co/Co2+ half-cell. Calculate Ecell when conc. of Ni2+ = 0.078 M and of Co2+ = 0.492 M.The reduction potential for Ni2+ is -0.247 V and for... more
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04/18/20

What is the value of ΔG o in kJ at 25 oC for the reaction between the pair
What is the value of ΔG o in kJ at 25 oC for the reaction between the pair:Ag(s) and Mn2+(aq) to give Mn(s) and Ag+(aq)Use the reduction potential values for Ag+(aq) of +0.80 V and for Mn2+(aq) of... more
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04/18/20

What is the value of the equilibrium constant at 25 oC for the reaction between the pair
What is the value of the equilibrium constant at 25 oC for the reaction between the pair:Cr(s) and Fe2+(aq) to give Fe(s) and Cr3+(aq)Use the reduction potential values for Cr3+(aq) of -0.74 V and... more
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