04/10/21

Predict the sign of the entropy change for the following processes. Give a reason for your prediction. (a) Pb2+(aq)+S2−(aq)⟶PbS(s) (b) 2Fe(s)+32O2(g)⟶Fe2O2(s) (c) 2C6H14(l)+19O2(g)⟶14 H2O(g)+12 CO2(g)
Predict the sign of the entropy change for the following processes. Give a reason for your prediction.(a) Pb2+(aq)+S2−(aq)⟶PbS(s)(b) 2Fe(s)+32O2(g)⟶Fe2O2(s)(c) 2C6H14(l)+19O2(g)⟶14... more
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04/10/21

Common Ion effect: Calculate solubility

The molar solubility of silver phosphate in a 0.259 M silver nitrate solution is _____ M.
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04/10/21

How do you solve for volume to volume conversions and empirical formula?
Determine the molecular formula of the compound with an empirical formula of CH and a molar mass of 78.110 g/mol.
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04/10/21

How many grams of CaCl2 could be obtained if 15.0 g HCl is allowed to react with excess CaCO3? Balanced Equation: CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l)
Basic StoichiometryI am really confused /
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04/10/21

Practice problems - Rates of Reaction
2. In the reaction A + 2 B → 3 C + 4 D, the initial concentration of B was 0.0443 M after 17.3 min the concentration of B was 0.0305 M. What is the average rate of disappearance (M/s) of reactant... more
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04/10/21

Hess's Law of Heat Summation
Liquid hydrazine, N2H4(l), is a rocket fuel. It combusts in oxygen gas to form nitrogen gas and liquid water:N2H4(l) + O2(g) -> N2(g) + 2H2O(l)Use the following thermochemical equations to... more
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04/10/21

What is the total-ionic formula of sodium fluoride mixed with hydrochloric acid?
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04/10/21

A diprotic acid, H₂A, has Ka1 = 3.4 × 10⁻⁴ and Ka2 = 6.7 × 10⁻⁹. What is the pH of a 0.20 M solution of H₂A?
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04/10/21

An unknown weak acid with a concentration of 0.093 M has a pH of 1.80. What is the Ka of the weak acid?
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04/10/21

Write the basic equilibrium equation for (CH₃)₂NH.
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04/09/21

I2(g) + Cl2(g) < ==== > 2 ICl(g) An equilibrium mixture of the above contains 0.0100 atm I2(g), 0.0100 atm Cl2(g), and 0.0900 atm ICl(g) at 298 K. Calculate the Delta G at standard condition.

This was a multiple choice question. I don't know what I was doing wrong. I tried using the formula: delta G= delta G° + RT ln(Q)I got delta G° = -30440 J/mol by using the Gf table 2(-5.52)-19.4+0... more
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04/09/21

calculate the ph of a buffer system containing 1.0 m ch3cooh and 0.50 m ch3coona. (ka of acetic acid, CH3COOH is 1.8x10^-5)
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04/09/21

Balance the equations below assuming they occur in an acidic solution. (a) H2O2+Sn2+⟶H2O+Sn4+

Balance the equations below assuming they occur in an acidic solution. (a) H2O2+Sn2+⟶H2O+Sn4+   
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04/09/21

Calculate wavelength
Calculate the wavelength of: a.) an electron (9.10×10-31 kg) moving at a speed of 5.81×106 m/s (13000000 miles per hour).      b.) a baseball (0.140 kg) moving at a speed of 40.2 m/s... more
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04/09/21

How many particles are in a 34 g sample of Al2(SO4)3?
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04/09/21

A second order reaction is 41.5% complete in 500 sec.
a) Calculate the rate constant? b) What is the value of the half-life? c) How long will it take for the reaction to go to 25%, 80% completion?
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04/09/21

A first order reaction has a rate constant of 4.6x10^-2/sec and 8.10x10^-2/sec at 0°C and 20°C, respectively.
What is the value of the activation energy?
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04/09/21

Suggest why KMnO4 is used in titration and not another oxidizing reagent such as potassium dichromate.
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04/09/21

An unknown weak acid with a concentration of 0.093 M has a pH of 1.80. What is the Ka of the weak acid?
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04/09/21

An unknown weak base with a concentration of 0.0910 M has a pH of 10.70. What is the Kb of this base?
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04/09/21

A diprotic acid, H₂A, has Ka1 = 3.4 × 10⁻⁴ and Ka2 = 6.7 × 10⁻⁹. What is the pH of a 0.20 M solution of H₂A?
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04/09/21

Question and Inquiry

5. A chemist was studying the following reaction:     N2O4(g) ⇆  2 NO2(g)The chemist adds 0.171 mol of N2O4(g) to a 2.0 L container at 200°C. The system comes to equilibrium based on a K... more
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04/09/21

Question and Inquiry

4. Consider the decomposition of nitrogen trifluoride into nitrogen and fluorine below: 2 NF3  ⇆   N2(g) + 3 F2(g)  When 2.06 mol of NF3 is initially placed in a 2.00 L container and allowed to... more
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04/09/21

Question and Inquiry
3. For the following system at equilibrium, how will the concentration of methanol [CH3OH] be affected by the changes below?  CO(g) + 2 H2(g) ⇆  CH3OH(g) ΔH = -18 kJa) increasing the volume of... more
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04/09/21

Question and Inquiry

2. Le Chatelier’s Principle:If the reaction below is at chemical equilibrium, what would happen to the equilibrium position if the stresses below were applied?      heat + CH4(g) + 2... more
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