10/04/22

How to find the mass?
How many grams of solute are present in 485 mL of 0.870 M KBr?mass of solute:
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10/04/22

Enthalpy formation from enthalpy reaction
A scientist measures the standard enthalpy change for the following reaction to be -208.5 kJ :CO(g) + 3 H2(g)CH4(g) + H2O(g)Based on this value and the standard enthalpies of formation for the... more
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10/03/22

How many moles of tin atoms are in a pure tin cup with a mass of 34.7g?
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10/01/22

Electrochemical Cell
Calculate the cell voltage of concentrations of NaF and KCl when each has 0.10 M in the following cell Pb(s) | PbF2(s) | F−(aq) || Cl−(aq) | AgCl(s) | Ag(s)
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09/30/22

what will the total gas pressure be in the vessel after 55.0 min?
The decomposition of dimethyl ether at 504°C is a first order reaction with a half-life of 27.0 min. (CH₃)₂O(g) → CH₄(g) + H₂(g) + CO(g) A reaction vessel is charged with dimethyl ether at an... more
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09/29/22

Calculate the equilibrium constant, Kp, she obtained for this reaction.
A student ran the following reaction in the laboratory at 1090 K:2SO2(g) + O2(g) 2SO3(g)When she introduced SO2(g) and O2(g) into a 1.00 L evacuated container, so that the initial partial pressure... more
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09/29/22

Calculate the equilibrium concentration of H2S when 0.514 moles of NH4HS (s) are introduced into a 1.00 L vessel at 298 K.
The equilibrium constant, Kc , for the following reaction is 1.80 x 10-4 at 298 K.NH4HS (g) -----> NH3 (g) + H2S (g) <-----Calculate the equilibrium concentration of H2S when... more
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09/29/22

A gas mixture contains 45.6 % nitrogen and 54.4 % xenon by mass. What is the partial pressure of xenon in the mixture if the total pressure is 629 mbar ?

A gas mixture contains 45.6 % nitrogen and 54.4 % xenon by mass. What is the partial pressure of xenon in the mixture if the total pressure is 629 mbar ?
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09/28/22

for the equation C6H12O6(s) ---> 3C2H4(g)+3O2(g), find Delta S, Delta G, and the Temperature using the information given.
C6​H12​O6​(s)⟶3C2​H4​(g)+3O2​(g)Given S°= 212.1 J/molK, ΔG°= -910.56 kJ/mol and}ΔH°= -1274.5 kJ/mol for C6H12O6 (s). You can look up the other values  Using the tabulated ΔG° values find, ΔS ,ΔG°,... more
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09/22/22

Chemical equations
Write a net ionic equation for the reaction that occurs when aqueous solutions of barium hydroxide and hydroiodic acid are combined.
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09/22/22

what is the nuclear equation for 24195Am
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09/18/22

For the compound BeN:
a. Construct a fully labeled MO diagram.b. Determine the bond order.c. Is the compound paramagnetic or diamagnetic?
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09/18/22

Place the following in order of increasing dipole moment, explain your reasoning.
I. BCl3 II. BIF2 III. BClF2
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09/18/22

Sketch each of the following structures
a. mer-CoCl3Br3b. fac- CoCl3Br3c. cis- SCl2Fd. trans- Pd(NH3)2Cl2
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09/18/22

Chemistry Question
A solution of F− is prepared by dissolving 0.0805±0.0006 g NaF (molar mass = 41.989±0.001 g/mol) in 120.00±0.06 mL of water. Calculate the concentration of F− in solution and its absolute uncertainty. more
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09/18/22

Calculate the wavelength, in nanometers, of the spectral line produced when an electron in a hydrogen atom undergoes the transition from the energy level 𝑛=7 to the level 𝑛=1.

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09/18/22

What is the ionization energy for an atom (in kiljoules per mole) in the ejected electron has a velocity of 5.82 x 10^5 m s ^-1
with the ionized with a 460nm wavelength laser. Mass of the electron is 9.1094 x10 ^-31kg (answer to be to one decimal place)
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09/15/22

Calculate the molar mass of ascorbic acid.
A student crushed a vitamin C tablet that weighed 1.634g, and transferred 1.552g of the powder into a 100 mL volumetric flask. After diluting to the 100.00mL mark, they titrated a 20.00mL aliquot... more
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09/14/22

Please write balanced net ionic equations for some of the ionic solids that formed in the precipitation lab. (Use the lowest possible coefficients.
Please write balanced net ionic equations for some of the ionic solids that formed in the precipitation lab. (Use the lowest possible coefficients. Omit states-of-matter from your answer. Enter... more
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09/13/22

What is H in kJ for the process of freezing a 39.8 g sample of liquid lead at its normal melting point of 328 °C.
The following information is given for lead at 1 atm: boiling point = 1740 °C Hvap(1740 °C) = 178 kJ/mol melting point = 328 °C Hfus(328 °C) = 4.77 kJ/mol specific heat solid... more
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09/11/22

If the atoms within a molecule have a charge, are the atoms fully charged (e.g., +1) or are they partially charged (e.g., +0.2)?
Let’s consider attractions:a. If the atoms within a molecule have a charge, are the atoms fully charged (e.g., +1) or are they partiallycharged (e.g., +0.2)?b. How about if we are comparing ions?
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09/05/22

The vapor pressure of liquid diethyl ether, C2H5OC2H5, is 100. mm Hg at 262 K. A 0.288 g sample of liquid C2H5OC2H5 is placed in a closed, evacuated 500. mL container at a temperature of 262 K.
The vapor pressure of liquid diethyl ether, C2H5OC2H5, is 100. mm Hg at 262 K. A 0.288 g sample of liquid C2H5OC2H5 is placed in a closed, evacuated 500. mL container at a temperature of 262... more
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07/16/22

Sodium sulfate is slowly added to a solution containing 0.0500 M Ca2+(aq) and 0.0270 M Ag+(aq) . What will be the concentration of Ca2+(aq) when Ag2SO4(s) begins to precipitate?
[Ca2+]=M?What percentage of the Ca2+(aq) can be precipitated from the Ag+(aq) by selective precipitation?percentage:%?
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07/16/22

Can I get help on this please
You need to prepare 2.33 L of a HF/NaF buffer that has a pH of 3.39 and an osmotic pressure of 1.95 atm at 298 K. The p𝐾a for HF is 3.18. What masses of HF and NaF are needed to prepare the buffer?... more
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07/16/22

May I get help on this
What are the molar concentrations of acetic acid (CH3COOH) and sodium acetate (CH3COONa) in an aqueous solution buffered at a pH of 4.06 that has a freezing point of −2.09 °C? Assume complete... more
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