25,963 Answered Questions for the topic chemistry

Chemistry

10/21/24

At 460 K, the rate constant for this reaction is k = 5.8 × 10–6 s–1 and the activation energy is Ea = 265 kJ/mol. What is the frequency factor for this reaction?

The compound 1,1-difluoroethane decomposes at elevated temperatures to give fluoroethylene and hydrogen fluoride according to the equation: CH3CHF2----->CH2CHF+HF
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Chemistry

10/21/24

Calculate the value of the equilibrium constant for the following reaction.
Given:2C <==> D ... Kc = 6.52x10-4Given:D <===> 3A + 3B ... Kc = 4.32x10-2A + B <==> C
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Chemistry

10/21/24

Refund for my tutor session
Hello, I hired a tutor but I am unsatisfied with the session and help I received. It was the first time I got help from a tutor on this website and it was not a good fit. How can I request a refund?
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Chemistry

10/21/24

What was the wavelength of the second photon emitted?
A ground-state H atom absorbs a photon of wavelength 97.25 nm, and its electron attains a higherenergy level. The atom then emits two photos: one of wavelength 486 nm to reach an intermediatelevel,... more
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Chemistry

10/21/24

Which element in the following set would you expect to have the lowest IE3? Why?
Na, Mg, Al Al, Li, B
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Chemistry

10/21/24

13.9 g of NACl dissovled in 200. g of water. the temperature of the water fall from 22.0 degrees celsius to 19.7 degrees celsius over 6.7 mins. Is this reaction exothermic, endothermic, or neither?
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Chemistry

10/19/24

need a carbon remover.
hello,what chemical can i use to remove carbon from firearm parts?i have been told that carbon cant be broken down into other elementsso when a company make a "carbon dissolver " its mostly a... more
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Chemistry Organic Chemistry

10/14/24

Structures and Intra/Inter-Molecular Hydrogen Bonds
I need help drawing the structures in particular how the conformation would make for good H-bond alignment. I am also unsure of how to properly indicate the intra and inter-molecular H-bonds.1)... more
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Chemistry

10/12/24

Change in enthalpy
change in enthalpy for the reaction 4xy³ + 7z² —> 6y²z + 4xz²? Given the thermal equations x²+3y² —> 2xy³, ΔH equals -310, x² + 2z² —> 2xz², ΔH-180, 2y² plus z² chemical reaction 2y²z, ΔH-... more
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10/11/24

diels-alder reaction with a-Terpinene and an N-phenylmaleimide
I conducted a diels-alder reaction using a-Terpinene and an N-phenylmaleimide derivative and I am to come up with a structure for the incomplete dienophile. I've been given an nmr table that... more
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Chemistry

10/10/24

Energy Released for a Photon of Light.
A bright violet line occurs at 435.8 nm in the emission spectrum of mercury vapor. What amount of energy must be released by an electron in a mercury atom to produce a photon of this light?Please... more
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Chemistry

10/10/24

Moles contained in 50g mgcl2
How many are contained in 50g mgcl2
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Chemistry

10/10/24

Moles contained in 50g mgcl2
How many are contained in 50g mgcl2
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10/09/24

Chem E Question

In the Deacon process for the manufacture of chlorine, HCl and O2 react to form Cl2 andH2O. Sufficient air is fed to provide 35% excess oxygen, and the fractional conversion of HCl is 85%.a) ... more
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10/09/24

Chemical Engineering Question
An oxygen tank with a volume of 2.5 ft3 is kept in a room at 50°F. An engineer has used theideal gas equation of state to determine that if the tank is first evacuated and then charged with 35.3lbm... more
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Chemistry

10/09/24

Calculate the heat change per mole of reaction
React 100.0 mL of 0.400 M hydrochloric acid with 90.0 mL of 0.500 M sodium hydroxide in a bomb calorimeter with a heat capacity of 6.25 kJ/°C. The reaction made the temperature of the thermometer... more
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Chemistry

10/09/24

Calculate molar enthalpy
React 50.0 mL of 0.250 M sulfuric acid with 50.0 mL of 0.250 M potassium hydroxide in a bomb calorimeter. If the initial temperature of both reactants were 22.10oC and the final temperature of the... more
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Chemistry

10/09/24

Calculate the molar enthalpy

React 50.0 mL of 0.250 M sulfuric acid with 50.0 mL of 0.250 M potassium hydroxide in a bomb calorimeter. If the initial temperature of both reactants were 22.10oC and the final temperature of the... more
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Chemistry

10/09/24

Unable to find my chemistry tutor in database

I signed up for this tutoring service with Leah A. (chemistry) because she came recommended by a family friend. I logged into your programs to set up a session with her but could not find her in... more
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Chemistry

10/08/24

4. How many hydrogen atoms are in 345.3 g of iron(III) hydrogen phosphate? 5. How many atoms of chlorine are in 550.0 mL of carbon tetrachloride? The density of carbon tetrachloride is 1.59 g/mL.
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Chemistry Science

10/07/24

Copper (I) Chloride Reaction Sequence
Copper (I) chloride is prepared from metallic copper, through a series of chemical reactions. In the lab one will make copper(II), remove the excess oxidizing agent (nitrate ion), and then reduce... more
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Chemistry

10/07/24

An atom of carbon-11 emits a positron. Express your answer as a nuclear equation.
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Chemistry

10/07/24

An atom of carbon-11 emits a positron. Express your answer as a nuclear equation.
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Chemistry Organic Chemistry

10/05/24

Finding products of the given reactions, considering regiochemistry where applicable.
What would be the products for the following reactions, considering regiochemistry where applicable, whilst noting that some reactions may yield multple products.a) (R)-(tert-butyl)cyclohex-1-ene... more
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Chemistry

10/03/24

How do i find the percent yield?
Gaseous butane (CH3(CH2)2CH3) will react with gaseous oxygen (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O). Suppose 5.23 g of butane is mixed with 33.g of oxygen. Calculate... more
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