07/03/21

Electro Chemistry
Calculate the ΔGO (in kJ/mol) for the following reaction at 25.0℃.Sn^+2(aq) + Mn(s) ---> Sn(s) + Mn^+2(aq)
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07/03/21

Electro Chemistry
Calculate the grams of Sr(s) produced when 1.93 Amperes are passed through the cell shown below for 6.58 hours.Sr^+2(aq) + 2Cl^-1(aq) ---> Sr(s) + Cl_2(g)
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07/02/21

chemistry finding moles

How many moles of oxygen are produced by the decomposition of 6.0 moles of potassium chlorate, KClO3? 2KClO3 → 2KCl + 3O2
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07/02/21

What is the precipitate?
A solution contains Ba2+, Hg2+, Ag+, NH4+, and Ni2+. Identify the precipitate after the addition of 6 M HCl.
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07/02/21

What is the pH?
What is the approximate pH at the equivalence point of a weak acid-strong base titration if 75.00 mL of aqueous hydrofluoric acid requires 90.00 mL of 0.200 M KOH to reach the equivalence point?... more
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07/01/21

ThermoChemistry
Calculate the grams of Ca(s) produced when 1.65 Amperes are passed through the cell shown below for 4.96 hours.Ca^+2(aq) + 2Cl^−1(aq) → Ca(s) + Cl_2(g)I originally got 6.13 but that is completely... more
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07/01/21

A STP Sample ......
At STP a sample of gas with a mass of 23.4 grams occupies 1.50 L. What is the molar mass of this gas?
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06/30/21

Cell Potential Question
Calculate the Eocell for the redox reaction shown below in volts: 3K(s)+Cr+3(aq)→3K+1(aq)+Cr(s)
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06/30/21

Cell Potential Question
Calculate the Eocell for the redox reaction shown below in volts: 2Li(s)+Mg+2(aq)→2Li+1(aq)+Mg(s)
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06/30/21

electrochemistry
Consider a galvanic cell consisting of:Cu^2+ + 2e^-2 --> Cu 0.34Zn^2+ + 2e^- --> Zn -0.76Write the reaction occurring at the anode:Write the reaction occurring at the cathode: Write the... more
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06/30/21

Thermochemistry
Calculate the ΔGO (in kJ/mol) for the following reaction at 25.0℃. 2Cr+3(aq)+2Mg(s)→2Cr(s)+3Mg+2(aq)
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06/30/21

Thermochemistry
Calculate the non-standard cell potential (in V) for the following reaction at 86.51 ℃ with the following concentrations: [Mg+2] = 7.00×10−7 M; [Cu+2] = 2.158 M Cu+2(aq) + Mg(s) --> Cu(s) +... more
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06/30/21

For a solution that is 0.164 M NH3 and 0.102 M NH4Cl, calculate the [OH-]. NOTE: You may enter a number in scientific notation as: 6.6E-66 or 6.66*10^-66 or 6.66x10^-66 (DO NOT ADD Spaces)
Can you pls assist in answering this question?
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06/29/21

What is the concentration?

Calculate the concentration of bicarbonate ion, HCO3-, in a 0.050 M H2CO3 solution that has the stepwise dissociation constants Ka1 = 4.3 × 10-7 and Ka2 = 5.6 × 10-11.
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06/29/21

What is the partial pressure?
Dinitrogen pentoxide decomposes in the gas phase to form nitrogen dioxide and oxygen gas. The reaction is first order in dinitrogen pentoxide and has a half-life of 2.81  at 25  C. If a 1.6 L... more
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06/29/21

a laboratory group

A laboratory group measures an excess of a volatile liquid. They add this to an empty flask with a volume of 705 mL. They heat the sample to 88.5 degrees Celcius until all the liquid is vaporized.... more
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06/28/21

What volume of 9% NaCl solution is needed to make 100ml of a 0.9% NaCl solution


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06/28/21

What is the activation energy and rate constant?
A reaction has a rate constant of 1.25×10−4 s−1 at 27  ∘C and 0.230 s−1 at 79  ∘C. Determine the activation barrier for the reaction.  What is the value of the rate constant at 17 ∘C?
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06/28/21

What is the partial pressure?
If a 1.6 −L reaction vessel initially contains 760 torrtorrof N2O5N2O5 at 25 ∘C, what partial pressure of O2O2 will be present in the vessel after 230 minutes?
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06/28/21

Chemistry problem

Calculate ΔHo for the process Zn(s) + S(s) + 2 O2(g) → ZnSO4(s)from the following information Zn(s) + S(s) → ZnS(s)  ΔHo = -118.1 kJ/mol ZnS(s) + 2 O2(g) → ZnSO4(s)  ΔHo =... more
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06/28/21

Enaloy question .............
Consider the following balanced reaction:2 A2 + B → C + 2 DWhat is the enthalpy of reaction if the enthalpy of formation of the compounds is given as Compound Enthalpy of Formation... more
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06/28/21

IS the formula different?
Consider the following balanced reaction:2 A2 + 3 B → C2 + 2 DWhat is the enthalpy of reaction if the enthalpy of formation of the compounds is given as Compound Enthalpy of Formation... more
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06/27/21

Totally confused on the steps
The combustion of hexane is given by the following reaction.2 C6H14 + 19 O2  12 CO2 + 14 H2OThe enthalpy of reaction is −4163.0 kJ/mol. How much energy (in joules) will be released if 53.70 grams... more
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06/26/21

Calorimetry problem
Calculate the internal energy (in Joules) of a system that loses 288.0 J that is compressed with a pressure of 2.60 atm from 8.160 L to 1.00 L. 
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06/25/21

A vile contains radioactive iodine -131 with inactivity of 2.0 mCi/mL. If a thyroid test requires 3.6 mCi in an “atomic cocktail,” how many millimeters are used to prepare the iodine -131 solution?
Express the volume to two significant figures and include the appropriate units.
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