11/11/19

Using the provided table and the equation below, determine the heat of formation for PbS. 2 PbS (s) + 3 O₂ (g) → 2 SO₂ (g) + 2 PbO (s) ∆H° = -828.4 kJ/mol
Substance ∆Hf° (kJ/mol)O2 (g) 0SO2 (g) -296.9PbO (s) -217.3
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11/11/19

Using the provided table and the equation below, determine the heat of formation for KClO₂. 2 KClO₃ (s) → 2 KClO₂ (s) + O₂ (g) ∆H° = 296.2 kJ/mol
Substance ∆Hf° (kJ/mol)KClO3 (s) -391.2O2 (g) 0
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11/11/19

Redox Chemistry
What is the percent by mass of oxalate ion in a 0.278 g sample of the iron salt that took 17.64 mL of 0.02085 M potassium permanganate to titrate to a light pink endpoint.
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11/11/19

Redox Chemistry
What is the molarity (mol/L) of a potassium permanganate solution if 12.02 mL of it was used to titrate a 10.84 mL sample of a 0.1826 M sodium oxalate standard solution.
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11/11/19

Chemistry Math Question?
The acid ionization constant of Fe(H2O)62+(aq) is 3E-6. Compute the pH of a 0.04 M aqueous solution of Fe(NO3)2.
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11/11/19

Chemistry Math Question?
A saturated solution of unknown metal hydroxide M(OH)2 has a measured pH of 8.13. Determine the value of Ksp for the compound.
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11/11/19

Chemistry Math Question?
120.0 mL of a .40 M solution of unknown weak acid is combined with 90 ml of a .25 M strong base, and the final pH of the solution is measured to be 4.47. What is the pKa of the unknown acid?
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11/11/19

Chemistry Math Question?
When 40 mL of 0.266 M sulfuric acid is titrated with a standard solution of 0.278 M NaOH solution, what volume of base is required to reach the second equivalence point of the titration?
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11/11/19

Which gas will have the greatest Henry's law constant?
Which of these gases will have the greatest Henry's law constant in a water solution? He, Ne, Ar, Kr, or Xe. Explain
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11/11/19

Find the pH of an aqueous solution
What is the pH of 0.19 M aqueous KClO solution? The pKa of hypochlorous acid is 7.53.
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11/10/19

For the reaction below, Kc = 4.60 × 10⁻⁶. What is the equilibrium concentration of B if the reaction begins with 0.700 M A? A (g) ⇌ 3 B (g)
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11/10/19

50 mL sodium hydroxide contains 0.050 mole of hydroxide ions mixed with a solution of hydrochloric acid containing more than 0.050 moles of hydrogen ions. How many moles of water were formed?
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11/10/19

Find delta G reaction
ATP (aq) + H2O --> ADP (aq) + HPO4 2- (aq)delta G^o rxn = -30.5 kj/mol at 37 C with pH of 7.0. Find delta G rxn in which [ATP] = 5.0 mM, [ADP] = 0.70 mM and [HPO4 2-] = 5.0 mM
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11/10/19

the volume, in liters, occupied by 45.0 g of Ar gas.
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11/10/19

How many orbitals at H.O.E.L. (Highest occupied energy level) of Boron?
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11/09/19

If Kp = 947 for the reaction below at 310 K, then what is the value of Kc? 2 A (g) + B (s) ⇌ 2 C (s) + D (g)
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11/09/19

Thermochemistry
A ball bearing at 259.0 °C is dropped into a cup containing 246.1 g of water at 17.7 °C. The water and ball bearing come to a temperature of 36.3 °C. What is the heat capacity of the ball bearing... more
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11/09/19

Highest occupied energy level
What is the highest occupied energy level for Boron?
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11/08/19

A 5% dextrose IV fluid contains 35 mEq of K+ per liter of solution. If a patient receives 245 mL of the IV solution, how many moles of K+ were delivered?
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11/08/19

General Chemistry Lab

The IR spectrum of ethyl alcohol contains a peak at wavenumber 3362 cm-1 that corresponds to the O-H bond stretch. What is the wavelength in μm for this bond stretch in ethyl alcohol? What is the... more
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11/08/19

Will this addition of the water interfere with the determination of the molarity of the HCl sample?
a student adds 25.00 ml of distilled water to a 15.00ml sample of HCl of an unknown molarity and titrates this against a 0.095 -M NaOH soloution. Will this addition of the water interfere with the... more
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11/08/19

a titration of 25.0ml HCl
a titration of 25.0ml HCl of an unknown molarity requires 18.45ml of 0.085M NaOH solution what is the molarity of the HCl solution
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11/08/19

Stoichiometry Moles equations
Al + 3 NaOH → Al(OH)3 + 3 NaIn the balanced chemical equation above, how many grams of Al(OH)3 will be produced if 6.82 grams of NaOH reacts completely
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11/08/19

Integrated rate law and half life sample problems

The decomposition of certain insecticide in water follows first-order kinetics with a rate constant of 1.45yr ^ -1 . A quantity of this insecticide is washed into a lake on June 1, leading to a... more
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11/08/19

Integrated rate law half life sample problems
The rate of the reaction O + NO2 ----------> NO + O2 was studied at a certain temperature. time O (atoms/cm3) 0 5.0 x 109 1.0 x 10-2 1.9 x 109 2.0 x 10-2 6.8 x 108 3.0 x... more
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