25,963 Answered Questions for the topic chemistry

Chemistry

08/08/23

What is the n-factor of (NH4)2 SO4?
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Chemistry

08/07/23

Need help with these lab questions
Colorimetric determination of Manganese in steel by standard additions:I need to find the ppm of Mn in KMnO4 standard solution. Now I know the answer to this is 1119ppm however I am not sure on how... more
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Chemistry

08/07/23

Electrons in charge
You perform an electrochemical reaction in which 0.300 mol of Cu+ are reduced to solid CuHow many coulombs of charge are transferred?I calculate the columbs correctly 2.84x 10^4 CBut how would I... more
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Chemistry

08/07/23

Please Help with this ecell question
Calculate the potential for each cell as written at 25 ∘C.. Indicate whether the metal electrode in the half‑reaction opposite the standard hydrogen electrode, S.H.E., would be the anode or the... more
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Chemistry

08/07/23

Calculate the heat energy released when 26.5 g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point.
Constants for mercury at 1 atm heat capacity of Hg(l)Hg(l) 28.0 J/(mol⋅K)28.0 J/(mol⋅K) melting point 234.32 K enthalpy of fusion 2.29 kJ/mol
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Chemistry

08/06/23

Transmittance Question
A 0.0195 M solution of a certain analyte exhibits 41.8% 𝑇 at a wavelength of 280 nm. What will the percent transmittance be for a 0.0251 M solution of the same analyte? Assume the path lengths for... more
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Chemistry

08/06/23

Concentration problem Please help
An unknown amount of a compound with a molecular mass of 259.36 g/mol is dissolved in a 10 mL volumetric flask. A 1.00 mL aliquot of this solution is transferred to a 25 mL volumetric flask, and... more
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Chemistry

08/06/23

QUESTION ABOUT HEAT ENERGY IN JOULES
Given the following information for substance X:Specific Heat (c) of solid phase: 2.0 J/g°CHeat of Fusion (Lf): 100 J/gSpecific Heat (c) of liquid phase: 5.0 J/g°CHeat of Vaporization (Lv): 1000... more
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Chemistry

08/05/23

Acid & Base Buffer questions
Find the pH and the volume (mL) of 0.487 M HNO3 needed to reach the equivalence point in the titration of 2.65 L of 0.0750 M pyridine (C5H5N, Kb = 1.7 × 10−9). 
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Chemistry

08/05/23

What is the oxidizing agent: 3Cu+6H{+} + 2HNO3 = 3Cu{+2} + 2NO + 4H2O
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Chemistry

08/05/23

Help with Absorbance question
Treatment of ammonia with phenol in the presence of hypochlorite yields indophenol, a blue product that absrobs light at 625 nm, which can be used for the spectrophotometric determination... more
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Chemistry

08/05/23

Which of the following is the best oxidizing agent? OF O Ni O Fe3t Он* O P62+
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Chemistry

08/05/23

Which of the following is the best oxidizing agent? OF O Ni O Fe3t Он* O P62+
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Chemistry

08/04/23

Voltage Generated
The voltage generated by the zinc concentration cell described by the line... more
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Chemistry

08/04/23

oxidation number of As in Na3(AsS3)?
is this correct?(AsS3) --- +3x - 6 = 3x = 9so ON of As is +9
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Chemistry

08/04/23

For the electrochemical cell Pb(s) + Cu²⁺(aq) → Pb²⁺(aq) + Cu(s) (E° = 0.466 V, [Cu²⁺] = 2.50 M), what is the value of E when [Pb²⁺] = 0.055 M? Assume T is 298 K.
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Chemistry

08/03/23

Limiting Reactants
Liquid octane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water. Suppose 5.7 g of octane is mixed with 32.6 g of oxygen. Calculate the minimum mass of octane that... more
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Chemistry

08/03/23

Solving for a reactant using a chemical equation
Ammonium phosphate is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid with ammonia. What mass of ammonium phosphate is produced by the reaction of 8.00 g of... more
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Chemistry

08/03/23

Solving moles-to-moles limiting reactant problems
Methane gas and oxygen gas react to form carbon dioxide gas and water vapor. Suppose you have 13.0 mol of CH4 and 5.0 mol of O2 in a reactor. Calculate the largest amount of CO2 that could be... more
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Chemistry

08/03/23

What would be the temperature inside the pressure cooker if the vapor pressure of water was 3.60 atm? The enthalpy of vaporization of water is 40.7 kJ/mol.
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Chemistry

08/03/23

Please help me solve this question Not sure where to start
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for... more
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Chemistry

08/03/23

Lab ppm Question help
Hi, guys in a lab report about Iron and its calibration curve I am supposed to solve for the ppm of Fe in a standard solution. My data in the chart says that the ppm should equal 1.04. I'm supposed... more
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Chemistry

08/02/23

Intensity of serum signal Question

The lithium concentration in serum taken from a patient being treated with lithium for manic-depressive illness was analyzed using flame emission spectroscopy. A sample of the serum gave a reading... more
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Chemistry

08/02/23

Please help with calculating ppm
This has to do with the calibration curve of Fethe ppm = 1.04the mL is 50.0concentration of standard Fe = 259.7 ppmabsorbance =0.299 corrected absorbance = 0.278I'm having trouble getting to the... more
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Chemistry

08/02/23

Lithium Cocentration Question
The lithium concentration in serum taken from a patient being treated with lithium for manic-depressive illness was analyzed using flame emission spectroscopy. A sample of the serum gave a reading... more
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