04/04/23

I need help understanding this question

How can you combine the half-reactions below to give the overall reaction for the electrolysis of water? Reaction A: 2H⁺ + 2e⁻ → H₂ Reaction B: ½ O₂ + 2H⁺ + 2e⁻ → H₂OHow can you combine the... more
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04/04/23

CHM161 Help. Labflow report need help answering a question
 If all of the iron from Question 1 is diluted in a 50-mL flask (Sample Stock Solution), what is the concentration, in ppm, of the resulting solution?
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04/04/23

What is the change in enthalpy when 1.50 moles of H2 are reacted with an excess O₂ of according to the following balanced chemical reaction: 2H₂(g)+O₂(g)→2H₂O(l) ∆H=-572 kj
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04/04/23

Organic acids and bases
Which weak acid would be best to use when preparing a buffer solution with a pH of 8.40 ? an acid with p𝐾a=4.30 an acid with p𝐾a=9.60 an acid with p𝐾a=6.20 an acid with p𝐾a=3.20 an acid with... more
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04/04/23

Organic acids and bases
A weak acid, HA, has a p𝐾a of 4.655 . If a solution of this acid has a pH of 4.935 , what percentage of the acid is not ionized? Assume all H+ in the solution came from the ionization of HA.
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04/04/23

organic acids and bases
Enough of a monoprotic weak acid is dissolved in water to produce a 0.0158 M solution. The pH of the resulting solution is 2.59. Calculate the p𝐾a for the acid.
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04/04/23

What is the concentration of M2+ ions at equilibrium?
The formation constant* of [M(CN)4]2− is 7.70×1016, where M is a generic metal.A 0.160 mole quantity of M(NO3)2 is added to a liter of 0.910 M NaCN solution. What is the concentration of M2+ ions... more
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04/04/23

chemistry question
Hydrazine, N2H4, reacts with oxygen to form nitrogen gas and water.N2H4(aq)+O2(g)⟶N2(g)+2H2O(l)If 4.05 g of N2H4 reacts with excess oxygen and produces 0.350 L of N2, at 295 K and 1.00 atm, what is... more
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04/04/23

What is the concentration of the H2SO4 solution?
20.0020.00 mL of a H2SO4 solution with an unknown concentration was titrated to a phenolphthalein endpoint with 35.7135.71 mL of a 0.12070.1207 M NaOH solution.
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04/03/23

Chemistry Frequency

The energy of this wavelength of light is 1.00 x 10^-8 to 1.00 x 10^-7 kJ/photon.What is the wavelength of ultraviolet radiation that has an energy of 1.99 x 10^-20 kJ/photon?Wavelength... more
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04/03/23

Chemistry Frequency

The wavelength of a particular color of green light is 534 nm.The energy of this wavelength of light is .... kJ/photon.
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04/03/23

Chemistry Frequency

A local FM radio station broadcasts at an energy of 6.29 x 10^-29 kJ/photon. (1MHz = 10^6 s -1) Calculate the frequency at which it is broadcasting.Frequency = ... MHz
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04/02/23

In the reaction, 2HgO(s)⟶2Hg(s)+O2(g) what mass of mercury(II) oxide, HgO, would be required to produce 905 L of oxygen, O2, measured at STP?
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04/01/23

Determine the volume in milliliters of a 0.260 M NaOH solution needed to neutralize a 295 mL solution of 0.173 M HCl and 0.346 M H2SO4.
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04/01/23

What volume of 0.100 M KOH is needed to react completely with 17.7 mL of 0.300 M H2SO4 ?
Balanced equation H2SO4(aq)+2KOH(aq)⟶2H2O(l)+K2SO4(aq)
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04/01/23

How many moles of C₄H₁₀ (isobutane) must be reacted according to the following balanced chemical reaction to transfer -187.5 kJ of heat? 2 C₄H₁₀(g) + 13 O₂(g) → 8 CO₂(g) + 10 H₂O(g) ∆H = -2868.8 kJ
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04/01/23

What concentration (in M) of the strong base NaOH is required to obtain an aqueous solution with the pH value of 13.2?
What concentration (in M) of the strong base NaOH is required to obtain an aqueous solution with the pH value of 13.2?
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03/31/23

Write the buffer solution equation then write two chemical equations showing how a buffer reacts with a). NaOH and b). HCl. Please explain which component of the buffer reacts with each.
Write the buffer solution equation then write two chemical equations showing how a buffer reacts with a). NaOH and b). HCl. Please explain which component of the buffer reacts with each.Context: 15... more
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03/31/23

A volume of 500.0 mL of 0.130 M NaOH is added to 605 mL of 0.200 M weak acid (𝐾a=3.87×10−5). What is the pH of the resulting buffer?
HA(aq)+OH−(aq)⟶H2O(l)+A−(aq)pH=?
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03/31/23

Calculate the pH at the equivalence point for the titration of 0.200 M methylamine (CH3NH2) with 0.200 M HCl. The 𝐾b of methylamine is 5.0×10−4.
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03/31/23

25.00 mL of a H2SO4 solution with an unknown concentration was titrated to a phenolphthalein endpoint with 41.85 mL of a 0.1299 M NaOH solution.
What is the concentration of the H2SO4 solution?[H2SO4]=?
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03/31/23

May I please get help on this?
Calculate the pH of the resulting solution if 28.0 mL of 0.280 M HCl(aq) is added to 38.0 mL of 0.280 M NaOH(aq).andCalculate the pH of the resulting solution if 28.0 mL of 0.280 M... more
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03/31/23

Strong acid-strong base titration relies on the reaction of a stong acid with a strong base.
Complete each titration reaction by writing the products in molecular form and balancing the equation. States of matter are optional.HCL+KOH->H2SO4+NaOH->
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03/31/23

May I get help on this?
A 1.42 L buffer solution consists of 0.168 M butanoic acid and 0.302 M sodium butanoate. Calculate the pH of the solution following the addition of 0.061 moles of NaOH. Assume that any contribution... more
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03/31/23

Can I get help on this?
A 1.42 L buffer solution consists of 0.310 M propanoic acid and 0.199 M sodium propanoate. Calculate the pH of the solution following the addition of 0.076 mol HCl. Assume that any contribution of... more
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