08/05/24

Any one interested to learn chemistry?
From 9to 11 std.
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08/03/24

Why is dimensional analysis useful?
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07/26/24

stoichiometry help
1.) how many grams of Fe2O3 can form from 29.2 grams of O2? 2.) show the strategies for solving this problem (the question gives: Grams O2———>_______———>_______———> grams Fe2O3)3.) show... more
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07/20/24

answer with appropriate units
How many grams of copper react to give 1.20 g of Ag?Cu(s)+2AgNO3(aq)→Cu(NO3)2(aq)+2Ag(s)
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07/11/24

How many Joules of heat are removed from 500 g of H2O when it is cooled from 190 C to -35C ?
How many Joules of heat are removed from 500 g of H2O when it is cooled from 190 C to -35C ? The specific heat of solid water is 2.09 J/g*C, liquid is 4.18 J/g*C, and gas is 2.02 J/g*C. The molar... more
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07/11/24

Chemistry 30- Molar Enthalpy and Combustion Question HELP!
A 5.00 g sample of nitromethane was burned in a calorimeter that contained 250 g of water at 20.5°C. Calculate the final temperature of the water if all 5.00 g of nitromethane is combusted. Hint -... more
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07/10/24

4 Gas Laws and Stoichiometry Questions
1.) A bacterial culture isolated from sewage produced 34.5 mL of methane, CH4, at 30.0 degrees C and749 mm Hg. What is the volume of methane at STP (0 degrees C, 760 mm Hg)?My work: (P1V1)/(T1) =... more
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07/10/24

Gas Laws/Stoichiometry Chemistry Questions
A gas has a volume of 450 mL at 35 degrees C. If the volume changes to 400 mL, what is the newtemperature (give your answer in C)?What volume of Hydrogen gas at STP may be prepared by the reaction... more
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07/07/24

Write the balanced NET ionic equation for the reaction when AgC₂H₃O₂ and Ni(ClO₄)₂ are mixed in aqueous solution
Write the balanced NET ionic equation for the reaction when AgC₂H₃O₂ and Ni(ClO₄)₂ are mixed in aqueous solution
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07/05/24

Microliter conversion

How many microliters of solvent is needed for 0.1g, 0.05g, and 0.009g to have the same content of NaNO3? Also will 0.1g have more liquid solvent because it is the highest concentration?
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07/04/24

nitrate calculation

If I have different levels of sodium nitrate (0.1g, 0.05g, 0.009g) what are the calculations in order to make one concentrated stock solution? I know that the end number needs to be in... more
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07/01/24

Prepare a buffer solution
Calculate how you would prepare 1.000 l of a pH 10.25 buffer made from NH3 and NH4Cl. You are provided with 2.000 l of 3.00 M NH3 and 250 g NH4Cl solid. Kb= 1.75x10-5 . Assume that the addition of... more
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06/30/24

How much energy (in J ) is lost when a sample of iron with a mass of 28.5 g cools from 75.0 ∘C to 29.0 ∘C ?

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06/20/24

Solving for a reaction in solution

Suppose an industrial quality chemist analyzes a sample from a copper processing plant in the following way. He added powdered iron to a 150 ml copper ii sulfate sample from the plant until no more... more
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06/17/24

How many sodium ions are used if 2.3 moles of sodium iodide react completely?
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06/10/24

General Chemistry
A cereal contains 11.0 grams of sucrose(C₁₂H₂₂O₁₁) per 60.0 grams of cereal. What mass in grams of cereal must be eaten to consume a total of 0.0424 moles of sucrose?
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06/10/24

Chemistry Homework
A 6.082 gram sample of an organic compound containing, and is analyzed by combustion analysis and 10.84 grams of and 4.438 grams of are produced.In a separate experiment, the molar mass is found to... more
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06/06/24

I need help with these problems
A series of reactions containing 20μΜ invertase with different sucrose concentrations in each areperformed and initial velocities are measured. Invertase has a kcat of 1 x 10 4. KM is measured to... more
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06/05/24

Do we find the pka’s for these?
To separate the proteins, you need to prepare 1600 mL of a 182 mM buffer at pH 7.8. You check the shelf and find the following reagents: Develop a detailed protocol for preparing this buffer. Note... more
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06/05/24

Help with solving this problems
The ratio of the two products to sucrose is 140,000 at 310K.A) Calculate delta Go for this reaction at 310K. B) If the change in standard enthalpy for this reaction is -14.4 kJ/mol, what is the... more
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05/31/24

Calculate the [H+] when the pOH = 5.48
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05/30/24

significant figures in pH calculations
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05/29/24

Help me solve these questions!
Consider the simple reaction below: A ⇄ B + C ΔGo = -3.7 kcal/mol1. What is the K eq for this reaction under physiological conditions? 2. If a reaction is set up with 0.1μM of A,... more
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05/29/24

Help solve this!
For the reaction X + Y ⇄ Z with a Keq of 0.822A) What is the standard free energy change for this reaction at 37 degrees Celsius?B) If [X] = 10mM, [Y] = 0.21M, [Z] = 125 μM, which direction does... more
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05/22/24

This question concerns net ionic equations and spectator ions.

In a reaction between aqueous solutions of AgNO3 and LiCl, identify the spectator ions and the precipitate compound in the reaction.
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