09/26/21

A solution of CaCl2 in water forms a mixture that is 28.0% calcium chloride by mass. If the total mass of the mixture is 888.8 g, what masses of CaCl2 and water were used?
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09/26/21

Silver chromate (Ag2CrO4) is a hazardous compound which may cause irritations in respiratory tracts and injuries in liver.

Silver chromate (Ag2CrO4) is a hazardous compound which may cause irritations in respiratory tracts and injuries in liver. It will dissolve in water following the chemical equilibrium below.... more
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09/26/21

Show the equilibrium expression for the above equilibrium and state the unit of the equilibrium constant in terms of mol dm-3

Barium sulfate (BaSO4) is widely used as a contrast agent in the body for diagnoses of certain disorders in the digestive system. Barium sulfate can barely dissolve in water following the chemical... more
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09/26/21

Will the answer be -562.5 kJ?
When determining the energy of a reaction where 0.250 mol of a substance with a ΔHcomb = -2250.0 kJ/mol reacts, we perform this calculation: −2250.0 kJ 1mol = x kJ 0.250 mol OR 0.250 mol −2250.0 kJ... more
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09/25/21

why is Au a larger atom than Cu

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09/25/21

120 grams of N2h4 reacts with 140.0 grams 0f H2O2 to produce HNO3 and H2O. how many grams of HNO3 are produced? {N=14.0 ; H=1.00; O=16.0
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09/25/21

A 925 mL NaCl solution is diluted to a volume of 1.28 L and a concentration of 8.00 mol L−1 . What was the initial concentration?
Express the molar concentration numerically.
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09/25/21

20.0g sample of al reacts to produce 32.7g of Al2O3. what is the percentage yield of the reaction?

4Al(s) + 3O2(g) ==> 2Al2O3(s) ... balanced equationuse the method (Al) mole: mass Al: Al3O3 mole: mass (Al2O3)
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09/24/21

How many grams of water vapor are formed?
A Hydrogen-filled balloon is ignited, and 2.50 g of hydrogen reacts with 17.50 g of oxygen. How many grams of water vapor form assuming the only product is water (use correct significant figures)?
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09/24/21

Having problem solving this problems
1-What is the subscript for the hydrogen in a molecular formula of a compound containing only carbon and hydrogen which upon combustion produced 1.55 g CO2 and 0.762 g H2O? The molar mass of a... more
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09/24/21

If 3.65g of butane is burned underneath a cup holding 1.00 L of water at 21.0oC, what will the final temperature of the water be (ΔHcomb = -3325 kJ/mol)?

Need help solving this.
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09/24/21

I know the calculation will be higher, but I need help explaining.
A student is determining the enthalpy of solution for ammonium nitrate by adding ammonium nitrate to a calorimeter and measuring the temperature change. The accepted value is ΔHsol’n = 25.7... more
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09/24/21

When 25.0 mL of 0.25 mol/L LiOH and 25.0 mL of 0.25 mol/L HCl are mixed together, the temperature warms 15.8oC. What is the molar enthalpy of neutralization for LiOH?
Need help solving this, only one temperature present.
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09/24/21

A-Level Chemistry equilibrium question
N2O4(g) <==> 2NO2(g) Kp = 0.115 atm at 298KIf the equilibrium partial pressure of N2O4 is 0.500 atmosphere, calculate the equilibrium partial pressure of NO2, and the total... more
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09/24/21

In an effusion experiment, it was determined that nitrogen gas, N2, effused at a rate 1.812 times faster than an unknown gas. What is the molar mass of the unknown gas?
(molar mass of N2 = 28.02 g/mol) Can u pleasee, give me the GRESA format of it?? (Given, Required, Equation, Solution, then answer) :)
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09/24/21

Based on the data below, what is the empirical formula of compound Q?
Two new and previously unidentified elements have been discovered, elements X and Y. Elements X and Y are known to form into two compounds X2Y3 and a second compound, which is purely composed of... more
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09/24/21

Calculate the wavelength in nanometers of the spectral line produced when an election and a hydrogen atom undergoes the transition from energy level n=7 to n= 1
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09/24/21

chemistry problem
You carefully weigh out 12.00 g of CaCO3 powder and add it to 48.60 g of HCl solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a... more
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09/23/21

At a certain temperature, the Kp for the decomposition of H2S is 0.890.
Initially, only H2S is present at a pressure of 0.176 atm in a closed container. What is the total pressure in the container at equilibrium? H2S(g) ---> (and the reverse arrow) H2(g)+S(g) 
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09/23/21

consider the reaction
A (aq) --> 2 B (aq) Kc = 7.85 x 10^-6 at 500 KIf a 2.40 M sample of A is heated to 500 K, what is the concentration of  at equilibrium?
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09/23/21

General Chemistry I
Calculate the energy change when an electron falls from the n =8 energy level to the n = 1 energy level in a hydrogen atom.
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09/23/21

Chemistry I HW!
What is the wavelength, in nanometers, of the bright line of the hydrogen emission spectrum corresponding to the following transition? n =5 to n =3 
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09/23/21

Please find the balanced equation, theoretical yield, atom economy and estimated e factor ) based on the procedure To prepare the catalyst, sodium molybdate dihydrate (0.30 g; 1.2 mmol), and
Please find the balanced equation, theoretical yield, atom economy and estimated e factor )based on the procedureTo prepare the catalyst, sodium molybdate dihydrate (0.30 g; 1.2 mmol), and 4 M HCl... more
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09/23/21

When there is going to be a frost in Florida, farmers will spray their crops with water before the frost hits thereby preventing the fruit from freezing. Explain why this helps to save the fruit.

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09/23/21

If forming new bonds releases energy, how can a reaction ever be endothermic?
Need help with this question.
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