03/17/22

What is the percentage of KHP in the mixture?
Suppose you are titrating a solid mixture containing KHP (molar mass=204.2 g/mol) and a salt compound. KHP reacts with NaOH according to the equation:KHP+NaOH ⟶ H2O + NaKP*You prepare the analyte... more
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03/17/22

A certain lamp produces 10.0 L of CO₂(g) at STP. How many grams of calcium carbide must have reacted in the lamp?
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03/16/22

How many grams of AlCl₃ are produced if 30.0 g of H₂ are produced in the following reaction: 2 Al + 6 HCl → 2 AlCl₃ + 3 H₂

How many grams of AlCl₃ are produced if 30.0 g of H₂ are produced in the following reaction: 2 Al + 6 HCl → 2 AlCl₃ + 3 H₂ 
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03/16/22

A chemist wants to extract the gold from 35.93 g of AuCl3 · 2 H2O (gold(III) chloride dihydrate) by electrolysis of an aqueous solution. What mass of gold could be obtained from this sample?

A chemist wants to extract the gold from 35.93 g of AuCl3 · 2 H2O (gold(III) chloride dihydrate) by electrolysis of an aqueous solution. What mass of gold could be obtained from this sample? Answer... more
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03/16/22

Solubility Equilibria Questions
A soluti‎on con‎tains 0.25 M Ni(NO3)2 and 0.25 M Cu(NO3)2.A. Ca‎n the me‎tal ions be sep‎arated by slowly adding Na2CO3 aq sol‎ution? Assu‎me that for successful separat‎ion 99% of the metal ion... more
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03/16/22

Buffer chemistry

How many mL of 1.07 M HCIO4 (aq) should be added to 1.00 g of imidazole to give it a pH of 6.993?
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03/16/22

Buffer chemistry

A buffer was prepared by dissolving 0.100 mol of a weak acid, HA (pKa = 5.00) plus 0.050 mol of the salt of its conjugate base, NaA, in 1.00 L of solution. What is the pH of the buffer?
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03/16/22

Chemistry Buffer

Which of the following acids would be most suitable for preparing a buffer of pH =3.10: hydrogen peroxide, propanoic acid, or cyanoacetic acid? Explain?
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03/16/22

What is the Kb of the base PO−34 given that a 0.48M solution of the base has a pH of 12.70? The equation described by the Kb value is
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03/15/22

How much is needed to neutralize?
1) How many mL of 0.715 M HCl is required to neutralize 1.25 grams of sodium carbonate? (producing carbonic acid)the sample?2) How many grams of oxalic acid (H2C2O4) are required for a titration of... more
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03/15/22

What are the moles of acetic acid?
A student used 27.48 mL of solution of NaOH 0.31 M to titrate 10.00 mL of vinegar. a.  Calculate the moles of acetic acid in the sample b.  Calculate the grams of acetic acid (HC2H3O2) in the... more
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03/15/22

Buffer Titrations and pka
A buffer solution containing the acid HX and its conjugate base X-, has a pH=6.00.A 10.00 mL sample required 9.50 mL 0.1000 M NaOH to titrate the sample to the Basic equivalence point.13.50 mL... more
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03/15/22

Calculate the energy in joules and the wavelength in nanometers of the spectral line produced in the hydrogen spectrum when an electron falls from the tenth Bohr orbit to the fourth
Calculate the energy in joules and the wavelength in nanometers of the spectral line produced in the hydrogen spectrum when an electron falls from the tenth Bohr orbit to the fourth. In which... more
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03/15/22

What is the Possible Energy Collected in kJ if the power striking an oven 53.2 cm by 44.5 cm is 1394.0 watt/meters squared over 60.5 minutes?
What is the Possible Energy Collected in kJ if the power striking an oven 53.2 cm by 44.5 cm is 1394.0 watt/meters squared over 60.5 minutes?
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03/15/22

The reaction C(s)+2H2(g)⇌CH4(g) C ( s ) + 2 ⁢ H 2 ⁡ ( g ) ⇌ CH 4 ⁢ ( g ) has 𝐾p=0.263 K p = 0.263

The reaction C(s)+2H2(g)⇌CH4(g) C ( s ) + 2 ⁢ H 2 ⁡ ( g ) ⇌ CH 4 ⁢ ( g ) has 𝐾p=0.263 K p = 0.263 at 1000. K.Calculate the total pressure when 5.984 g of H2 and 8.621 g of C(s) ... more
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03/15/22

What is the pH of the solution?
You have 1.00 liter of a buffer solution where the concentration of lactic acid (HC3H5O3) is 0.200 M and the concentration of sodium lactate (NaC3H5O3) is 0.160 M. The pKa for lactic acid is 3.85.... more
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03/14/22

25cm cube ethyl with density 0.79 added to graduated cylinder weight 44.28 what will be the weight of cylinder plus alcohol
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03/14/22

If the supplier sends only 1000 pedals one week, then how many tricycles would you be able to manufacture? Assume that none of the other parts will run out before using all the pedals.
A. 500B. 250C. 150D. 450
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03/14/22

The reaction C(s)+2H2(g)⇌CH4(g)
The reactionC(s)+2H2(g)⇌CH4(g)has 𝐾p=0.263 at 1000. K. Calculate the total pressure at equilibrium when 5.984 g of H2 and 23.77 g of C(s) are placed in a 8.70 L flask and heated to 1000. K.
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03/14/22

When you use 55mL of 4.0 M hydrochloric acid how many grams of zinc do you need to react with it?
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03/14/22

Calculate the molarity.
The solution contains 21.7g of NaCl in a 653 mL solution.
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03/13/22

Born-Haber cycle exercise
Calculate the lattice energy of CuBr(s) using a Born-Haber cycle. Enthalpy of sublimation of Cu(s) = 337.7 kJ/mol 1^st ionization energy of Cu(g) = 745 kJ/mol Enthalpy of vaporization of Br_2 (l) =... more
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03/13/22

Chemistry activity series lab
Post-1982 pennies have a zinc core with a thin copper outer shell. Using your activity series predict what would happen if a post-1982 penny were put into a solution of hydrochloric acid?
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03/13/22

Chemistry activity series lab

An activity series could also be created for the halogens. Describe a set of tests that you could perform in order to accomplish this.
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03/13/22

BALANCE- Pb(NO 3 ​ ) 2 ​ ⟶ PbO + NO 2 ​ + O 2 ​

Please do show the way too.
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