05/14/21

How many grams of carbon dioxide are produced when 2.05 moles of carbon of octane (C8H18) combust?
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05/14/21

A 13.27 g sample of a compound contains 8.47 g of iron, Fe, 1.57 g of phosphorus, P, and oxygen, O. Calculate the empirical formula for the compound.
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05/14/21

Practice #1 – Limiting Reactants in Moles
    How many moles of water can be produced with 4.3 moles of H2 and 5.6 moles of O2? Which reactant is limiting? How many moles of the excess reactant will be left after the... more
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05/14/21

What is the [OH-] in a 50.0 mL solution of 0.050 M HClO4?
Help would be really appreciated!
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05/14/21

How many mL of strong 17.5 M nitric acid will i need to make 500 mL of a 2.5 M weaker solution?
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05/14/21

What is your new volume?
You have been given 500mL of a 6 M HCl solution. You add water til the final volume is 1500 mL. What is your new volume?
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05/13/21

Please help me ???
Elizabeth wants to precipitate calcium ion in a CaCl2 solution. She finds that calcium oxalate, CaC2O4, is very insoluble in water. Therefore, she decides to add sodium oxalate, Na2C2O4, to... more
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05/13/21

Since the heat gained by the water in equals the heat lost, calculate the specific heat of copper.

mass of calorimeter (g) 2.50 mass of calorimeter & water(g) 84.02 mass of water (g) 81.52 mass of metal (g) 4.42 Ti of cool water (℃) 21.2 Ti of metal... more
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05/13/21

please help me with chemistry and heat
Calculate the amount of heat needed to melt 2.0 kg of iron at its melting point (1809 K) given that: ΔHfus = 13.80 kJ/mol.A. 27,600 kJB. 25,000kJ    C. 494 kJD. 27.6 kJ
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05/13/21

please help me with chemistry and heat

What is the heat required to vaporize 54.3 g of liquid ammonia, NH3, at its boiling point? The ΔH° of vaporization of ammonia is 23.4 kJ/mol. Use a molar mass with at least as many significant... more
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05/13/21

Carbon disulfide is produced by the reaction of carbon and sulfur dioxide
Carbon disulfide is produced by the reaction of carbon and sulfur dioxide. What is the percent yield of carbon disulfide if the reaction of 180.0 g of sulfur dioxide produces 72.0 grams of carbon... more
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05/13/21

A 1.00 × 10–6 g sample of nobelium-254, has a half-life of 55. What is the percentage of the sample remains after 5 minutes?
A 1.00 × 10–6 g sample of nobelium-254, has a half-life of 55. What is the percentage of the sample remains after 5 minutes?
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05/13/21

The 𝐾a of a monoprotic weak acid is 0.00304. What is the percent ionization of a 0.154 M solution of this acid?
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05/13/21

At 25 °C, only 0.0360 mol of the generic salt AB3 is soluble in 1.00 L of water. What is the 𝐾sp of the salt at 25 °C?
AB3(s)↽−−⇀A3+(aq)+3B−(aq)
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05/13/21

What concentration of SO2−3 is in equilibrium with Ag2SO3(s) and 7.90×10−3 M Ag+ ?
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05/13/21

Calculate the cell potential for the reaction as written at 25.00 °C , given that [Cr2+]=0.860 M and [Sn2+]=0.0120 M . Use the standard reduction potentials in this table.
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05/13/21

A current of 3.98 A is passed through a Pb(NO3)2 solution. How long, in hours, would this current have to be applied to plate out 4.70 g of lead?
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05/13/21

Purification of nickel can be achieved by electrorefining nickel from an impure nickel anode onto a pure nickel cathode in an electrolytic cell.
How many hours will it take to plate 15.0 kg of nickel onto the cathode if the current passed through the cell is held constant at 31.5 A ? Assume the nickel in the electrolytic solution is... more
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05/13/21

A certain reaction has an enthalpy of Δ𝐻=−34 kJ and an activation energy of 𝐸a=53 kJ. What is the activation energy of the reverse reaction?
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05/13/21

A 0.744 g sample of sulfur hexafluoride gas at 61oC occupies a volume of 0.764 L, what is the pressure in torr? Answer needs to be rounded to 3 sig figs.
I don't know how to do the Ideal Gas law and need help.
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05/12/21

Calculate the heat gained by the cool water for copper, use the specific heat of water for this problem.
mass of calorimeter (g) 2.50 mass of calorimeter & water(g) 84.02 mass of water (g) 81.52 mass of metal (g) 4.42 Ti of cool water (℃) 21.2 Ti of metal (℃) 101.0 Tf of water... more
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05/12/21

What is the theoretical yield of iron when30 grams of aluminum are used in the reaction below? 2Al + 3FeO -->3Fe +Al₂O₃
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05/12/21

What is the mass defect of lithium? Assume the following:
Atomic number of lithium = 3Atomic mass of lithium = 7.0144 atomic mass units.Mass of 1 proton = 1.0073 atomic mass units.Mass of 1 neutron = 1.0087 atomic mass units.A. 0.0043 atomic mass... more
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05/12/21

Dry air is approximately 78% nitrogen, 21% oxygen and 1% argon, by number of molecules. What is the partial pressure of oxygen in a sample of dry air, if atmospheric pressure is 751 torr?
For each show your work question, state which gas law you would use, then show how you would set up the numbers in the gas law equation, including units, and finally, solve the equation, giving the... more
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05/12/21

Consider a 7% starch solution and a 2% starcg solution separated by a semipermiable membrane. Which process will occur?
A) water will flow from 2% into 7% starch solutionB) water will flow in both direction C) all of these will occurD) water will flow from 7% into 2% starch solution
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