J.R. S.

Chemistry

04/04/22

ClNO2 ( N is the central atom) Draw all the molecules by placing atoms on the grid and connecting them with bonds. Include all hydrogen atoms and all lone pairs of electrons.

Draw resonance structures for each of the following molecules or ions.

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Chemistry

04/04/22

General Chemistry

A gaseous fuel mixture contains 22.8% methane (CH4), 40.0% ethane (C2H6) and the rest propane (C3H8) by volume. When the fuel mixture contained in a 1.55 L tank, stored at 748 mmHg and 298 K,... more

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Chemistry

04/04/22

What is the concentration of 3.0% H2O2 in molar units?

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Chemistry

04/04/22

Determine the quantity (g) of pure MgSO4 in 2.4 g of MgSO4•7H2O. Show your work.

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Chemistry

04/04/22

a student conducted an experiment to determine the specific heat of an undefined metal

metal mass-45ginitial temp of metal-100 Cmass of water in styrofoam cup- 50ginitial temp of water in styrofoam cup- 23 Cfinal temp of water in styrofoam cup- 25 Cfinal temp of metal- 25 C

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Chemistry

04/03/22

What is the ΔrG for the following reaction (in kJ mol-1) at 298 K?

2 Si (s) + 3 H2 (g) ⇌ Si2H6 (g)The conditions for this reaction are:PH2 = 1.47 barPSi2H6 = 0.46 bar

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Chemistry

04/03/22

What is the equilibrium constant for a reaction at temperature 52.5 °C if the equilibrium constant at 21.3 °C is 42.7? For this reaction, ΔrH° = 10.4 kJ mol-1 .

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Chemistry Biochemistry Electrical Engineering

04/03/22

AP chemistry electrochemistry Galvanic cell

A galvanic cell consists of a silver electrode inserted into a 1.0 M AgNO3 solution connected through a salt bridge and an external circuit to a nickel electrode inserted in a 1.0 M Ni(NO3)2... more

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Chemistry

04/02/22

Calculations for preparing 100.0mL of a 1.25 x 10-4 M aqueous solution of Fe(NO3)3(aq) by diluting a stock solution of 0.0025M Fe(NO3)3 (aq). You will have a 100.0 mL volumetric flask to dilute in.

net ionic equation:Fe^3+(aq)+SCN-(aq)=FeSCN^2+(aq)

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Chemistry

04/02/22

Elements like iron have 2 valencies. So, how would I know which one to use?

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Math Science Chemistry

04/02/22

A doctor orders 7mg of compazine, which is used to treat nausea, vertigo, and migraine headaches. If the stock solution is 4.0% (m/v) , how many milliliters are administered to the patient?

Answer must have 1 significant figure.

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Chemistry Ap Chemistry

04/02/22

I am very confused about this problem - I was given the information that AgCl is insoluble in water, and then told to write the equation for the dissolution of AgCl(s) in water. I am super confused... more

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Chemistry

04/02/22

4 Part Question

You are given 60.0 mL of a 0.500 M dihydrogen phosphate / hydrogen phosphate buffer. If the buffer is 0.196 M H2PO4- and 0.304 M HPO42-, answer the following:Give your answers to 3 sigfigs.Initial... more

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Chemistry

04/02/22

Find Initial Moles

You are given 60.0 mL of a 0.500 M dihydrogen phosphate / hydrogen phosphate buffer. If the buffer is 0.196 M H2PO4- and 0.304 M HPO42-, answer the following:Give your answers to 3 sigfigs.Initial... more

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Chemistry Ap Chemistry

04/02/22

Finding equilibrium constant at different temperatures

I am given the reversible reaction N2O(g) + NO2(g) <--> 3NO(g).I am also told that Kc=1.4*10-10 at 200.0 degrees Celsius. Given that 300 mL of NO at 800 torr and 25 degrees Celsius are added... more

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Chemistry

04/02/22

chemistry experiment

Dibromoethane and potassium iodide react in methanol (the solvent) according to the equation: C2H4Br2 + 3KI → C2H4 + 2KBr + KI3 The initial rate of this reaction was determined in a series of... more

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Chemistry

04/01/22

You need to prepare 100.0 mL of a pH 4.00 buffer solution using 0.100 M benzoic acid (p𝐾a=4.20) and 0.200 M sodium benzoate.

How many milliliters of each solution should be mixed to prepare this buffer?Benzoic acid: _____ mlSodium Benzoate:_____ ml

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Chemistry

04/01/22

What concentration of SO2−3 is in equilibrium with Ag2SO3(s) and 6.50×10−3 M Ag+?

The solubility expression is 𝐾sp=[Ag+]2[SO2−3]Plug in and the given [Ag+] value, then solve for [SO2-3].The Ksp value for Ag2SO3 is 1.50×10-14.[SO2−3]=____M

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Chemistry

04/01/22

If a buffer solution is 0.200 M in a weak acid ( 𝐾a=2.2×10−5) and 0.440 M in its conjugate base, what is the pH?

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Chemistry

04/01/22

At 25 °C, only 0.0880 mol of the generic salt AB is soluble in 1.00 L of water.

What is the of the salt at 25 °C?AB(s)−⇀A+(aq)+B−(aq)Ksp=_____

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Chemistry

04/01/22

Help with the answer please

A 66.63 g sample of iron (with a heat capacity of 0.450 J/g·°C) is heated to 100.0 °C. It is then transferred to a coffee cup calorimeter containing 38.74 g of water (specific heat of 4.184 J/g·°C)... more

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Chemistry

04/01/22

Please help! I dont understand.

What is the wavelength (in nm) of a photon if the energy is 7.61 × 10⁻¹⁹ J? (h = 6.626 × 10⁻³⁴ J • s)

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Chemistry

04/01/22

Please help I dont know how to solve

Determine the energy, in J, of a photon with a wavelength of 309 nm. (h = 6.626 × 10⁻³⁴ J • s and c = 3.00 × 10⁸ m/s)

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Chemistry

04/01/22

Using the following equilibria and Kc values:

Using the following equilibria and Kc values:SO3(g) + NO(g) ⇆ SO2(g) + NO2(g) Kc = 5.0 × 1082 SO3(g) + N2(g) ⇆ 2 SO2(g) + 2 NO(g) Kc = 1.5 × 10-4the calculated value of... more

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Chemistry

04/01/22

Chem 101 answers

What quantity in moles of precipitate are formed when 25.0 mL of 1.00 M FeCl₃ reacts with 23.5 mL of 1.50 M AgNO₃ in the following chemical reaction? FeCl₃ (aq) + 3 AgNO₃ (aq) → 3 AgCl (s) +... more

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Answers •1

ClNO2 ( N is the central atom) Draw all the molecules by placing atoms on the grid and connecting them with bonds. Include all hydrogen atoms and all lone pairs of electrons.

General Chemistry

What is the concentration of 3.0% H2O2 in molar units?

Determine the quantity (g) of pure MgSO4 in 2.4 g of MgSO4•7H2O. Show your work.

a student conducted an experiment to determine the specific heat of an undefined metal

What is the ΔrG for the following reaction (in kJ mol-1) at 298 K?

What is the equilibrium constant for a reaction at temperature 52.5 °C if the equilibrium constant at 21.3 °C is 42.7? For this reaction, ΔrH° = 10.4 kJ mol-1 .

AP chemistry electrochemistry Galvanic cell

Calculations for preparing 100.0mL of a 1.25 x 10-4 M aqueous solution of Fe(NO3)3(aq) by diluting a stock solution of 0.0025M Fe(NO3)3 (aq). You will have a 100.0 mL volumetric flask to dilute in.

Elements like iron have 2 valencies. So, how would I know which one to use?

A doctor orders 7mg of compazine, which is used to treat nausea, vertigo, and migraine headaches. If the stock solution is 4.0% (m/v) , how many milliliters are administered to the patient?

Dissolution of AgCl(s)

4 Part Question

Find Initial Moles

Finding equilibrium constant at different temperatures

chemistry experiment

You need to prepare 100.0 mL of a pH 4.00 buffer solution using 0.100 M benzoic acid (p𝐾a=4.20) and 0.200 M sodium benzoate.

What concentration of SO2−3 is in equilibrium with Ag2SO3(s) and 6.50×10−3 M Ag+?

If a buffer solution is 0.200 M in a weak acid ( 𝐾a=2.2×10−5) and 0.440 M in its conjugate base, what is the pH?

At 25 °C, only 0.0880 mol of the generic salt AB is soluble in 1.00 L of water.

Help with the answer please

Please help! I dont understand.

Please help I dont know how to solve

Using the following equilibria and Kc values:

Chem 101 answers

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