03/29/22

Calculate the pH at the equivalence point for the titration of 0.240 M methylamine (CH3NH2) with 0.240 M HCl. The 𝐾b of methylamine is 5.0×10−4. pH=

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03/29/22

Please help me with this problem
A 1.35 L buffer solution consists of 0.273 M propanoic acid and 0.104 M sodium propanoate. Calculate the pH of the solution following the addition of 0.068 mol HCl . Assume that any... more
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03/29/22

If a photon has a wavelength of 580.5 nm, what is the energy of the photon (in J)?
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03/29/22

Find the value of Ksp
Determine the value of Ksp for Mg(CN)2 by constructing an ICE table. The molar solubility of Mg(CN)2 is 1.4x10^-5 M at certain temperature.
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03/29/22

Molarity Solutions
How many moles of C12H22O11 are there in 2.93 L of a .500 M solution
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03/28/22

If 402 mol of octane combusts, what volume of carbon dioxcideis produced at 12.0 degrees celcius aand 0.995 atm
The combustion of octane, C8H18, proceeds according to the reaction shown. 2C8H18(l)+25O2(g)⟶16CO2(g)+18H2O(l) If 402 mol of octane combusts, what volume of carbon dioxide is produced at ... more
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03/28/22

A 3.283 g sample of a new organic material is combusted in a bomb calorimeter. The temperature of the calorimeter and its contents increase from 25.67 *C to 31.40 *C.

A 3.283 g sample of a new organic material is combusted in a bomb calorimeter. The temperature of the calorimeter and its contents increase from 25.67 *C to 31.40 *C. The heat capacity (calorimeter... more
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03/28/22

When 0.607 g of sodium metal is added to an excess of hydrochloric acid, 6310 J of heat are produced. What is the enthalpy of the reaction as written?
When 0.607 g of sodium metal is added to an excess of hydrochloric acid, 6310 J of heat are produced. What is the enthalpy of the reaction as written?2 Na(s)+2 HCl(aq)⟶2 NaCl(aq)+H2(g)Enthalpy of... more
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03/28/22

How much heat is released when 17.9 g of Al react with excess Fe2O3 ? Show the conversions required to solve this problem
How much heat is released when 17.9 g of Al react with excess Fe2O3 ? Show the conversions required to solve this problem2 Al(s)+Fe2O3(s)⟶Al2O3(s)+2 Fe(s) Δ𝐻=−852 kJ 17.9 g Al * (-------)... more
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03/28/22

The p𝐾a is 7.530 . A 53.0 mL solution of 0.132 M NaOCl is titrated with 0.271 M HCl . Calculate the pH of the solution after the addition of 7.77 mL of 0.271 M HCl .
The p𝐾a of hypochlorous acid is 7.530. A 53.0 mL solution of 0.132 M sodium hypochlorite (NaOCl) is titrated with 0.271 M HCl. Calculate the pH of the solution after the addition of 7.77 mL... more
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03/28/22

Calculate the volume, in milliliters, of 0.170 M NaOH that must be added to 397 mL 0.0591 M 3‑( 𝑁 ‑Morpholino) propanesulfonic acid (MOPS) to give the solution a pH of 7.55.
Calculate the volume, in milliliters, of 0.170 M NaOH that must be added to 397 mL 0.0591 M 3‑(𝑁‑Morpholino) propanesulfonic acid (MOPS) to give the solution a pH of 7.55. The p𝐾a of MOPS is 7.18.
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03/28/22

Calculate Mass Percent of SO2 in the air sample
Scientists determine the quantity of atmospheric sulfur dioxide (SO2 ), a large contributor to acid rain, by an indirect titration. First, a scientist collects a sample of air and reacts it with... more
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03/28/22

A volume of 500.0 mL of 0.130 M NaOH is added to 585 mL of 0.200 M weak acid (𝐾a=2.92×10−5). What is the pH of the resulting buffer? HA(aq)+OH−(aq)⟶H2O(l)+A−(aq)

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03/28/22

what is the pH of a solution made by mixing 60cm3 1.0M NaCH3COO(aq) with 40cm3 0.50 M HCl (aq)?
what is the pH of a solution made by mixing 60cm^3 1.0M NaCH3COO(aq) with 40cm^3 0.50 M HCl (aq)?Ka of CH3COOH is 1.8 x 10^-5.
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03/28/22

Chemistry , they are all together

uestion 4a (6 Points; 2 Points Each)Balance the following equations Ca(AlO2)2(s) + HCl (aq) ---> AlCl3(aq) + CaCl2(aq) + H2O(ℓ)    C6H6 + H2O2 ---> CO2 + H2O    AlCl3(s) + Ca3N2(s)... more
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03/28/22

A cape is designed for Lady Gaga's covered with 4280 sequins. If a sequin has a volume of 0.0229 cm3 and the sequins have a density of 41.1 g/cm3, calculate
(a) the mass in kg of sequins on Lady Gaga's cape.(b) the mass in lb of sequins on Lady Gaga's cape.
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03/28/22

On a 5 day wilderness expedition you'll need to heat 4.0 kg of water to the boiling point each day. The air temperature will average 25°C.
You have available canisters of compressed butane C4H10 fuel, which you'll burn to heat the water. Each canister has 100.g of butane in it. What is the minimum number of fuel canisters you must... more
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03/28/22

combustion analysis
A 3.967 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 9.018 grams of CO2 and 3.692 grams of H2O are produced. In a separate experiment, the molar... more
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03/27/22

Calculate the pH at the equivalence point for the titration of 0.170 M methylamine (CH3NH2) with 0.170 M HCl. The 𝐾b of methylamine is 5.0×10−4.
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03/27/22

Calculate the heat energy released when 20.4 g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point.
Calculate the heat energy released when 20.4 g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point.Constants for mercury at 1 atmheat capacity of Hg(l) 28.0... more
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03/27/22

Two 20.0 g ice cubes at −19.0 ∘C are placed into 215 g of water at 25.0 ∘C.

Two 20.0 g ice cubes at −19.0 ∘C are placed into 215 g of water at 25.0 ∘C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature, 𝑇f, of the water... more
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03/27/22

Iron metal is reacted with Diatomic Chlorine to produce iron(lll) chloride. please show the electrons that are transferred. Describe how they are gained/lost.
Please, explain me how to solve this!
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03/27/22

Hydrochloric Acid is added to Rubidium Hydroxide. Predict the products of this acid/base Reaction. State the balanced chemical equation.
Please, explain me how to solve this!
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03/27/22

An aqueous solution of Iron(lll) Nitrate is added to an aqueous solution of sodium sulfate.
An aqueous solution of Iron(lll) Nitrate is added to an aqueous solution of sodium sulfate. Please state balanced Molecular, total ionic, and complete ionic equations. Be sure to clearly label your... more
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03/27/22

On a 7 day wilderness expedition you'll need to heat 3.0kg of water to the boiling point each day. The air temperature will average 25°C.

You have available canisters of compressed propane C3H8 fuel. Each canister has 50. g of propane in it. What is the minimum number of fuel canisters you must bring? The standard heat of formation... more
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