25,963 Answered Questions for the topic chemistry

Chemistry

09/12/23

Refund for Trial lesson with Edward
Hi, We had a trial lesson with Edward. I would like to get a refund on that class. Thank you
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Chemistry

09/12/23

Chemistry answer the question below
A 100-g metal at 110°C is placed in a constant- pressure calorimeter containing 120-g of water at 18°C. If the specific heat of the metal is 0.57 J/gC and the calorimeter is 300 grams at 18°C... more
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Chemistry

09/12/23

Hydrogen in ammonium sulfate, (NH4)2SO4 , a substance used as a nitrogen fertilizer Express your answer using two significant figures.
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Chemistry

09/12/23

Calculate the standard enthalpy of formation of carbon disulfide (CS2) from its elements, given that.
Calculate the standard enthalpy of formation of carbon disulfide (CS2) from its elements, given that.C(graphite) + O2(g)-->CO2(g) ∆H°rxn= -393.5 kJ/molS(rhombic) + O2(g)-->SO2(g) ∆H°rxn=... more
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Chemistry

09/11/23

Charlotte is driving at 53.5 mi/h and receives a text message. She looks down at her phone and takes her eyes off the road for 3.97s. How far has Charlotte traveled in feet during this time?
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Chemistry

09/10/23

To what volume should 5.0 mL of an 2.0 M citric acid solution be diluted in order to obtain a final solution that is 1.50 M? Round to two significant digits.
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Chemistry

09/10/23

A 0.598 g sample of steam at 104.8 ∘C is condensed into a container with 4.91 g of water at 16.7 ∘C. What is the final temperature of the water mixture if no heat is lost?
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Chemistry

09/10/23

An Unknown compound contains only, C, H, and O. Combustion of 6.40g of this compound produced 15.6g CO2 and 6.40g H2O. what is the empirical formula of the unknown compound?

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Chemistry

09/09/23

Total ionic and net ionic equations
I need help with figuring out the total ionic equations and net ionic equations for: the addition of an acid to a buffer solution of NaHCO3 + Na2CO3 and the addition of a base to a buffer... more
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Chemistry

09/08/23

A 0.598 g sample of steam at 104.8 ∘C is condensed into a container with 4.91 g of water at 16.7 ∘C. What is the final temperature of the water mixture if no heat is lost?
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Chemistry

09/08/23

A 5.50 g mixture contains both lithium fluoride, LiF, and potassium fluoride, KF. If the mixture contains 3.59 g fluorine, what is the mass of the KF in the mixture?
Mass of KF in grams
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Chemistry

09/08/23

A 0.598 g sample of steam at 104.8 ∘C is condensed into a container with 4.91 g of water at 16.7 ∘C. What is the final temperature of the water mixture if no heat is lost?

and whoever answers this, can you please write where and how you got every number in the steps of the problem, please and thank you.
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Chemistry

09/07/23

If a metal block with all sides equal (cube) has a length of 2.23 cm and a mass of 451.43 g, what is the density? Answer in g/mL. Hint: 1 mL = 1 cm3
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Chemistry

09/07/23

I need help with question below
An atom has a diameter of 3.50 Å3.50 Å and the nucleus of that atom has a diameter of 3.50×10−5 Å3.50×10−5 Å. Determine the fraction of the volume of the atom that is taken up by the nucleus.... more
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Chemistry

09/07/23

How much NaOH is required to make a 100% solution in a total volume of 400 ml?
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Chemistry

09/07/23

Chemistry Calorimeter/ heat capacity
The combustion of toluene has delta E rxn of -3.91x10^3 kj/mol. When 1.55g of toluene (C7H8) undergoes combustion in a bomb calorimeter, the temperature rises from 23.12 Celsius to 37.57 Celsius.... more
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Chemistry

09/07/23

Chemistry- pressure-volume work question

A chemical process generates -615.4J of energy. If the piston expands from 155.9 ml to 4.025 L, what is the external pressure? formula: w= -P(delta V)notes:( I know that the system of the chemical... more
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Chemistry

09/07/23

Can you answers these questions? Topic: Diffusion
A student placed some crystals of potassium manganate(VII) at the bottom of a beaker of distilled water. She left the contents of the beaker to stand for one hour. After one hour, the student... more
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Chemistry

09/07/23

Chemistry what is the answer.

A liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is 84.0 mL.84.0 mL. The liquid solvent has a mass of 35.9 g35.9 g and a density... more
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Chemistry

09/06/23

what will the rate constant be at 276.0 °C?
The rate constant of a certain reaction is known to obey the Arrhenius equation, and to have an activation energy Ea = 59.0 kJ/mol. If the rate constant of this reaction is 6.7 × 102 M-1•s-1 at... more
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Chemistry

09/06/23

Use this data to answer the following questions.
A chemistry graduate student is studying the rate of this reaction:2HI (g) -> H2 (g) + I2 (g)She fills a reaction vessel with HI and measures its concentration as the reaction proceeds: Time... more
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Chemistry

09/06/23

Construct a Born-Haber cycle and use it to calculate the first electron affinity of chlorine.
ΔHatm(Cl) = +122 kJ/molΔHatm(Mg) = +148 KJ/molΔH1st ionisation energy(Mg) = +738 kJ/molΔH2nd ionisation energy(Mg) = +1451 kJ/molΔHlattice energy(MgCl2) = -2526 kJ/molΔHformation(MgCl2) = -641 kJ/mol
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Chemistry

09/06/23

Calculate the concentration

At a certain temperature this reaction follows second-order kinetics with a rate constant of 8.45 M-1•s-1:2H3PO4(aq) -> P2O5 (aq) + 3H2O (aq)Suppose a vessel contains H3PO4 at a concentration of... more
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Chemistry

09/06/23

Calculate how long it takes
At a certain temperature the rate of this reaction is second order in NH4OH with a rate constant of 0.012M-1•s-1NH4OH (aq) -> NH3 (aq) + H2O (aq)Suppose a vessel contains NH4OH at a... more
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Chemistry

09/06/23

After how much time is there only 225. mmol left?
Under certain conditions the rate of this reaction is zero order in hydrogen iodide with a rate constant of 0.0011 M•s-1.2 HI (g) -> H2 (g) + I2 (g)Suppose a 250. mL flask is charged under these... more
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