10/02/22

Please help, I have no idea what i'm doing
Striking a match stick on the matchbox involves the reaction of potassiumchlorate and red phosphorus with the following equation:10 KCIO3 (s) + 3P4 (s) -> 3P4O10(s) + 10 KCI (s).How much of each... more
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10/02/22

Potassium nitrate when exposed to heat decomposes to potassium oxide and gaseous nitrogen and oxygen
Potassium nitrate when exposed to heat decomposes to potassium oxideand gaseous nitrogen and oxygen:4KNO3(s) -> 2K2O(s) + 2N2(g)+502(g)To produce 28.3 g of oxygen, how many (a) moles of KNO3 and... more
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10/02/22

How much energy in kilocalories is emitted by Dr the complete combustion of 386 g of isooctane (C8H18)? (ΔHrxn = - 36 kJ/g C8H18)
How much energy in kilocalories is emitted by Dr the complete combustion of 386 g of isooctane (C8H18)?(ΔHrxn = - 36 kJ/g C8H18)
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10/01/22

How many neutrons are present in 5.14g of palladium-105 (isotopic mass = 104.91 amu)?
Correct answer: 1.74E24 neutronsCan you please provide the steps in obtaining the answer above?
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10/01/22

This is the problem
Given the Daniel Cell:   Ag| Ag1+ ||Zn2+ |ZnFind: a. Standard Potential of the cell. Write in the half- cell reactions     b. Using the Nernst equation, solve the potential of the cell . If the... more
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10/01/22

what mass, in g, of Pb₃(PO₄)₂ (FW 811.54 g/mol) precipitate will be formed
If 475 g of Pb(NO₃)₂ (FW 331.21 g/mol) is added to a solution containing 215 g of K₃PO₄ (FW 212.27 g/mol), what mass, in g, of Pb₃(PO₄)₂ (FW 811.54 g/mol) precipitate will be formed? The balanced... more
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10/01/22

convert 101.4 mol of propane (C3H8). The molar mass of propane is 44.1g/mol . show work
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10/01/22

Chemistry Home Work Question
A 175.0 mL solution of 2.573 M strontium nitrate is mixed with 200.0 mL of a 3.162 M sodium fluoride solution.Calculate the mass of the resulting strontium fluoride precipitate.mass:... more
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10/01/22

CHEMISTRY Question

 In a space shuttle, the CO2 that the crew exhales is removed from the air by a reaction within canisters of lithium hydroxide. Let's assume that one astronaut exhales about 825.  L of CO2 daily.... more
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09/30/22

One 55 g serving of cereal provides 265.0 mg of sodium, which is 10.9 % of the recommended daily allowance. Determine the amount of sodium (in grams and moles) in the recommended daily allowance.

One 55 g serving of cereal provides 265.0 mg of sodium, which is 10.9 % of the recommended daily allowance. Determine the amount of sodium (in grams and moles) in the recommended daily allowance.... more
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09/30/22

Chemistry PLS HELP
Consider the reaction.A(aq)↽−−⇀2B(aq)𝐾=3.04×10−6 at 500 KIf a 1.50 M sample of A is heated to 500 K, what is the concentration of B at equilibrium?
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09/30/22

chemistry pls help
At a certain temperature, 0.620 mol SO3 is placed in a 2.50 L container.2SO3(g)↽−−⇀2SO2(g)+O2(g)At equilibrium, 0.150 mol O2 is present. Calculate 𝐾c
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09/30/22

If the concentration of [Zn2+] =1.0 x10-3 M and for [Cu2+] = 1.0x10-4 M, compute the potential of the cell using the Nernst Equation.
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09/30/22

An electron in the n = 6 level emits a photon with a wavelength of 410.2 nm. To what energy level does the electron move?
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09/30/22

Mol fraction, first order, gaseous mixture
For the decomposition of gaseous dinitrogen pentoxide, 2N₂O₅(g) → 4NO₂(g) + O₂(g) the rate constant is k = 2.8 × 10⁻³ s⁻¹ at 60°C. The initial concentration of N₂O₅ is 2.95 mol/L in a closed... more
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09/30/22

enthalpy formation from Enthalpy reaction
A scientist measures the standard enthalpy change for the following reaction to be -13.1 kJ :CO(g) + H2O(l)CO2(g) + H2(g)Based on this value and the standard enthalpies of formation for the other... more
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09/30/22

Enthalpy reaction from enthalpy formation

Using standard heats of formation, calculate the standard enthalpy change for the following reaction.N2(g) + O2(g)2NO(g)Answer: KjALSOUsing standard heats of formation, calculate the standard... more
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09/29/22

What will be the concentrations of the three gases once equilibrium has been reestablished, if the equilibrium mixture is compressed at constant temperature to a volume of 10.0 L?
The equilibrium constant, K, for the following reaction is 2.21×10-2 at 616 K. COCl2(g) CO(g) + Cl2(g) An equilibrium mixture of the three gases in a 17.7 L container at 616 K... more
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09/29/22

If an equilibrium mixture of the three compounds in a 7.91 L container at 548 K contains 1.85 mol of NH4Cl(s) and 0.233 mol of NH3(g), the partial pressure of HCl(g) is ______ atm.
The equilibrium constant, Kp , for the following reaction is 1.04×10-2 at 548 K.NH4Cl(s) NH3(g) + HCl(g)If an equilibrium mixture of the three compounds in a 7.91 L container at 548 K... 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 495 K:PCl5(g) PCl3(g) + Cl2(g)When she introduced PCl5(g) at a pressure of 0.634 atm into a 1.00 L evacuated container, she found the... more
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09/29/22

Calculate the equilibrium concentrations of reactant and products when 0.303 moles of HI (g) are introduced into a 1.00 L vessel at 698 K.
The equilibrium constant, Kc, for the following reaction is 0.0180 at 698 K.2HI (g) ----> H2 (g) + I2 (g) <-----Calculate the equilibrium concentrations of reactant and products... more
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09/29/22

Calculate Kc at this temperature for the following reaction:
The equilibrium constant, Kc, for the following reaction is 2.44×10-2 at 596 K.NH4Cl(s) NH3(g) + HCl(g)Calculate Kc at this temperature for the following reaction:NH3(g) + HCl(g) NH4Cl(s)Kc =
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09/29/22

Calculate Kc at this temperature for the following reaction:
The equilibrium constant, Kc , for the following reaction is 10.1 at 352 K. CH2Cl2 (g) --> CH4 (g) + CCl4 (g) <---Calculate Kc  at this temperature for the following... more
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09/29/22

chemistry 100 help
In the following equation, what is the coefficient of HBr when the equation is balanced? ____CH4 + ____Br2 → ____CBr4 + ____ HBr
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09/29/22

Chemistry 100 help
Potassium superoxide (KO2) is used in some rebreathers used for fire fighting and mine rescues. It absorbs exhaled carbon dioxide (CO2) and releases molecular oxygen (O2) according to the following... more
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