04/27/22

Choosing best titrant
A stud‎ent is pre‎paring to titra‎te 25.00 mL of 0.2 M NaOH.  He has opti‎ons to use am‎ong 3 we‎ak mono‎protic ac‎id at same concentrati‎on, with ‎different aci‎d diss‎ociation con‎stants, WA1= 1... more
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04/27/22

Titrimetry Problem
The blo‎od alc‎ohol (C2H5OH) lev‎el can be determ‎ined by ti‎trating a sam‎ple of blo‎od pla‎sma with an aci‎dic potass‎ium dichrom‎ate solu‎tion, re‎sulting in the produc‎tion of Cr3+ (aq) and... more
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04/27/22

How many minutes will it take to plate out 16.22 g of Al metal from a solution of Al3+ using a current of 14.6 amps in an electrolytic cell?
How many minutes will it take to plate out 16.22 g of Al metal from a solution of Al3+ using a current of 14.6 amps in an electrolytic cell?
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04/27/22

Chemistry basics

A dimethylsulfoxide (DMSO) - aqueous solution - has a molality of 6.55 m. Calculate the mass percent, molefraction, the molarity, and the volume percent of this solution in terms of DMSO. The... more
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04/27/22

If 25.5 g of MgCl₂ are dissolved 500.0 g of water at 20.0 °C in an insulated container, a temperature change is observed. The ∆H of solution of MgCl₂ is -160.0 kJ/mol. Assuming that the specific ...
If 25.5 g of MgCl₂ are dissolved 500.0 g of water at 20.0 °C in an insulated container, a temperature change is observed. The ∆H of solution of MgCl₂ is -160.0 kJ/mol. Assuming that the specific... more
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04/27/22

​ 13.​Calculate the pH of a solution of 0.10M HOCl if 0.10M NaOCl is added. ​Ka HOCl = 3.5 x 10-8 (a) 7.46 (b) 8.0 (c) 6.54 (d) 8.54 (e) None

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04/27/22

Please help me with this problem

Given: ​2Fe(s) +3Br2 (l) = 2FeBr3(s); H = -249.8 KJ ​FeBr3(s) = FeBr2(s) + ½ Br2 (l); H = +18.4 KJ​            ​​Calculate the heat of formation ​2Fe(s) + 2Br2 (l) = FeBr2 (s)(a) 231.4 KJ (b)... more
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04/27/22

Please help me with this problem

          2.​Calculate the freezing point depression of a solution prepared by​dissolving 10.0g of Na2SO4 in 500g of water. At what temperature will this​solution actually freeze.   ​Kf(H2O) = 1.86... more
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04/26/22

Complete the 𝐾w expression for the autoionization of water.
This is the equation provided:Kw =1.00×10^−14= ?
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04/26/22

How many moles of sodium acetate are in the buffer?
This is the full question:To prepare an acetic acid/acetate buffer, a technician mixes 30.5 mL of  M acetic acid and 19.5 mL of  M sodium acetate in a 100‑mL volumetric flask and then dilutes the... more
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04/26/22

Write the balanced chemical equation for the combustion of octane and calculate the mass needed to release 5 mol of CO2
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04/26/22

Whats the chemical equation and how much hydrazine, in grams, is need to produce 10 mol of nitrogen gas?
The reaction between liquid hydrazine and liquid hydrogen peroxide is used to fuel rockets. The products are nitrogen gas and water. What's the balanced chemical equation and how much hydrazine, in... more
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04/26/22

Chemistry Stoichiometry
A 1.111 g sample of a new organic material is combusted in a bomb calorimeter. The temperature of the calorimeter and its contents increase from 24.19 degrees C to 30.92 degrees C.The heat capacity... more
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04/25/22

hydrochloric acid

When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced.CaCO3(s)+2HCl(aq)⟶CaCl2(aq)+H2O(l)+CO2(g)A) How many grams of calcium chloride will be... more
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04/25/22

Can anyone please help me answer this chemistry question?

NO will react with Cl2 according to the reaction: 2NO (g) + Cl2 (g) → 2NOCl (g). The following data were obtained experimentally.                       Initial [NO] (mol/L) Initial [Cl2]... more
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04/25/22

Can anyone please help me answer this chemistry question?

a) What is the rate law of a reaction that is zeroth-order with respect to [A], first order with respect to [B], and second-order with respect to [C]. b) Determine the effect on the overall... more
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04/25/22

A cylinder used in a lab contains a gas at 7.59 atm and 27 oC. What would the pressure of the gas be if the temperature changed to 77 oC?
the solution to the problem
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04/25/22

A 28.5 g piece of gold is heated and then allowed to cool. What is the change in temperature (°C) if the gold releases 0.106 kJ of heat as it cools? The molar heat capacity of gold is 25.4 J/mol･°C.
A 28.5 g piece of gold is heated and then allowed to cool. What is the change in temperature (°C) if the gold releases 0.106 kJ of heat as it cools? The molar heat capacity of gold is 25.4 J/mol･°C.
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04/25/22

draw amino acids in zwitterion form

Draw the individual amino acids that form this tripeptide below. Draw the zwitterion forms. Val-Thr-Cys
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04/24/22

Please help me with this

Calculate the molar solubility of PbI2 (ksp= 1.0x10^-8) in .50 M Pb(NO3)2
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04/24/22

Please help with this problem
Suppose you want to prepare a buffet of pH = 5.5 of the pair HCN/NaCN. calculate the mol ration NaCN/HCN necessary to prepare 1 liter of the buffer. Ka HCN= 4.0 x 10^-10
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04/23/22

How to find Ksp?
A student trying to determine the Ksp for Calcium hydroxide used 10.25 mL of0.060 M HCl to neutralize the initial volume of 12.00 mL Ca(OH) 2 solution.[OH^-]=0.0512 M[Ca^2+]=0.0256 M Ksp=?
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04/23/22

The concentration of Fe^2+ in a saturated solution of FeS is 6.38 x 10^-10 mol/L at a certain temperature. Calculate the Ksp for the compound at this temperature.
(report in hundredths place in scientific notation)
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04/23/22

The concentration of Cd^2+ in a saturated solution of Cd(OH)2 is 1.11 x 10^-5 mol/L at a certain temperature. Calculate the Ksp for the compound at this temperature.
(report to hundredths place and in scientific notation)
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04/23/22

The concentration of Zn^2+ in a saturated solution of ZnCO3 is 1.48 x 10^-5 mol/L at a certain temperature. Calculate the Ksp for the compound at this temperature.
(report to hundreths place and in scientific notation)
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