10/30/19

Thermochemistry
The value of ̇△H° for the reaction below is -72 kJ. ________ kJ of heat are released when 5.5 mol of HBr is formed in this reaction.H2 (g) + Br2 (g) => 2HBr (g)A) 0.44B) -72C) 72D) 144E) 198
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10/29/19

A solid 30.2 cm^3 block of KClO₃ is heated and decomposes according to the following reaction. What is the change in enthalpy in kj when all the KClO₃ decomposes? The density of KClO₃ is 2.34 g/cm^3
2KClO₃(s) → 2KCl(s) + 3O₂(g) ∆H = -89.4 kjI tried a few different conversions but none of them gave me the right answer
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10/29/19

How much heat is absorbed in the process of making 0.913 mol of CF₄ from the following reaction? C (s) + 2 F₂ (g) → CF₄ (g) ∆H° = 141.3 kJ/mol
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10/28/19

Chemistry density of gas in flask
A 3.35 g sample of an unknown gas at 37 ∘C and 1.05 atm is stored in a 2.75 L flask.What is the density of the gas?density:g/LWhat is the molar mass of the gas?molar mass:g/mol
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10/28/19

Write the balanced chemical equation for the reaction. Include phases.
When aqueous sodium hydroxide is added to a solution containing lead(II) nitrate, a solid precipitate forms.However, when additional aqueous hydroxide is added, the precipitate redissolves, forming... more
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10/28/19

Buffer Solution Chemistry Math Question 9
When 20 mL of 0.26 M sulfuric acid is titrated with a standard solution of 0.287 M NaOH solution, what volume of base is required to reach the second equivalence point of the titration?
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10/28/19

Buffer Solution Chemistry Math Question 8
100 mL of 0.05 M carbonic acid is titrated with strong base to its second equivalence point, which occurs when 240.0 mL of the base has been added. What is the pH of solution at the second... more
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10/28/19

Buffer Solution Chemistry Math Question 7
How many grams of sodium nitrite must be added to 300.0 mL of 0.3 M nitrous acid in order to prepare a buffer solution at pH 3.5? The pKa of nitrous acid is 3.337.
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10/28/19

Buffer Solution Chemistry Math Question 6
How many grams of potassium lactate (KC3H5O3) must be added to 276.0 ml of 0.2 M lactic acid in order to prepare a buffer solution at pH 3.3? The pKa of lactic acid is 3.8.
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10/28/19

Buffer Solution Chemistry Math Question 5

80 mL of a .40 M solution of unknown weak acid is combined with 80 ml of a .25 M strong base, and the final pH of the solution is measured to be 4.13. What is the pKa of the unknown acid?
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10/28/19

Buffer Solution Chemistry Math Question 4
When 440.0 mL of 0.45 M benzoic acid is titrated with 0.3 M NaOH, what is the pH of the solution after 190.0 mL of base has been added? The pKa for benzoic acid is 4.19.
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10/28/19

Buffer Solution Chemistry Math Question 3
If equal volumes of 0.11 M acetic acid and 0.06 M sodium hydroxide are mixed, what is the pH of the resulting solution? The pKa of acetic acid is 4.75
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10/28/19

Buffer Solution Chemistry Math Question 2
Benzoic acid is used to titrate an unknown base, and the pH of solution is recorded during the titration. Halfway to the ultimate endpoint of the titration, the pH of solution was recorded at 9.26.... more
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10/28/19

Buffer Solution Chemistry Math Question
How many grams of benzoic acid would you add to 25 mL of 0.45M sodium benzoate in order to prepare a buffer solution at pH=3.8? Ka of benzoic acid is 6.3E-5
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10/28/19

Determine the formation constant, Kf, of AC5 and the Ksp of AB
a)The generic metal A forms an insoluble salt AB(s) and a complex AC5(aq).The equilibrium concentrations in a solution of AC5 were found to be [A]= 0.100 M and [C]=0.0150 M. Determine the formation... more
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10/27/19

Equilibrium Question
Consider the reaction: A(aq) ---> 3B(aq) Kc= 1.28x10^-6 at 500KIf a 2.70M sample of A is heated to 500K, what is the concentration of B at equilibrium?
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10/27/19

A vessel contains 10.4 g of oxygen gas and 16.3 g of carbon dioxide. If the partial pressure of carbon dioxide gas is 1.84 atm, what is the partial pressure of oxygen gas (in atm)?
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10/27/19

Which of the following is a weak acid?
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10/26/19

Really need help with this chemistry question on heat of combustion
A sample of a new organic material is combusted in a bomb calorimeter. The temperature of the calorimeter and its contents increase from 25.95 C to 31.28 CThe heat capacity (calorimeter constant)... more
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10/26/19

Calculate the standard enthalpy change for the reaction at 25 ∘ C.
The reaction: HCl(g)+NaOH(s)⟶NaCl(s)+H2O(l)I tried answering this question multiple times, but the only answers I come up with are: -131.3 and 165.45. Both of those answers are incorrect. Where did... more
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10/26/19

What is the concentration of M+ ions at equilibrium?
The formation constant* of [M(CN) 2 ]− is 5.30×1018 , where M is a generic metal. A 0.130 mole quantity of M(NO3) is added to a liter of 0.520 M NaCN solution.
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10/26/19

Net ionic equation for reactions

When aqueous solutions of cobalt (II) sulfate and potassium phosphate are combined, solid cobalt (II) phosphate and a solution of potassium sulfate are formed. What is the net ionic equation for... more
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10/26/19

How many grams of solid NaCl must be added to 30.0 mL of 0.255 M AgNO3 solution to completely precipitate the silver?
How many grams of solid NaCl must be added to 30.0 mL of 0.255 M AgNO3 solution to completely precipitate the silver?
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10/26/19

A 1445 kg car is traveling down the road at 90.6 km/h. While traveling at this rate of speed, what is the kinetic energy of this vehicle in kilojoules?
It also requests that Ek = answer = kJ. How would I convert that?
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10/26/19

A 17.90 g sample of a compound contains 5.71 g of potassium, K, 5.18 g of chlorine, Cl, and oxygen, O. Calculate the empirical formula. Insert subscripts as needed.
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