08/23/20

i need help with this chemistry isu question, please help, would be greatly appreciated!!
An organic compound used in the production of sweet-smelling perfumes was isolated and examined. It was found to contain the composition of 54.52 % carbon, 9.17% hydrogen, and the remaining... more
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08/21/20

Assume that there is half as much sodium hydroxide as acetic acid in a solution. Write the equation for this reaction
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08/21/20

Chemistry standard notation

What is the standard notation for 2.5x10^3
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08/21/20

What volume in millilitres of 0.06176 M HCl is required to titrate 50.00 mL of solution containing 0.02159 M NaHCO3 and 0.0245 M Na2CO3 to a methyl red end point?
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08/21/20

A buffer solution of pH 4.58 is to be prepared from acetic acid (Ka = 1.80 x 10-5, sodium acetate and water. Find be the molar ratio of acetate ion to acetic acid in this solution to obtain this pH?
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08/21/20

What is the pH of the buffer formed by mixing 50.00 mL of 0.182 mol/L NaH2PO4 (Ka for H2PO4- = 6.32x10-8) with 50.00 mL of 0.112 mol/L NaOH.
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08/20/20

What volume of stock hydrochloric acid (12 mol/L) is required to make 500 mL of 0.075 mol/L acid solution?

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08/20/20

Chemistry difficult questions

A 50.0 g piece of impure zinc reacts with 129.0 cm3 hydrochloric acid (HCl solution) (density = 1.18 g/ cm3 ; 35.0 % by mass). Calculate the % of pure zinc in the piece. Treat an aluminium sheet... more
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08/20/20

Chemistry Exercise

How much mass% of CaCO3 does a piece of marble contain as at 25.0 °C and 1.013 atm, 900.0 mL of CO2 (gas) produced by the action of an excess HCl on 5.0 g of this marble?thank u in advance George... more
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08/20/20

Calculate the reduction potential (in V) at 25°C of each of the following half-cells.
The Nernst equation can be applied to half-reactions. Consider the following half-reactions.Cu2+ + 2 e− → CuMnO4− + 8 H + + 5 e− → Mn2+ + 4 H2OCalculate the reduction potential (in V) at 25°C of... more
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08/20/20

Calculate the pH of the cathode compartment for the following reaction?
Calculate the pH of the cathode compartment for the following reaction given ℰcell = 3.01 V when [Cr3+ ] = 0.15 M, [Al3+ ] = 0.31 M, and [Cr2O72− ] = 0.64 M. The reaction given is:2 Al(s) +... more
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08/19/20

Calculate E°, identify the cathode and anode, and give the overall balanced equation.

Calculate E°, identify the cathode and anode, and give the overall balanced equation. Assume that all concentrations are 1.0 M and that all partial pressures are 1.0 atm. Standard reduction... more
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08/18/20

Molarity Question based on H2SO4
How many millilitres of concentrated H2SO4 (16.0 M) is required to prepare 250 mL of 6.00 M H2SO4 solution?
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08/16/20

What happens to a system in equilibrium when the forward and backward reactions are reversible? Which reaction - forward or backward stops?
Think about reversible and what happens at equilibrium.
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08/15/20

The successive ionization energies in KJ/mol of an element P are 740, 1500, 7000, 10500, 13600, 18000 and 21700. Which ion is the most likely to be formed when P reacts with chloride?
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08/12/20

8.78 grams of nitrogen gas are allowed to react with 103 grams of hydrogen gas what’s is the Maximus mass of ammonium that can be formed

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08/10/20

The following information is given for cadmium at 1atm:
boiling point = 765 °C Hvap(765 °C) = 100 kJ/mol melting point = 321 °C Hfus(321 °C) = 6.11 kJ/mol specific heat solid= 0.230 J/g°C specific heat liquid = 0.264 J/g°C  kJ are... more
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08/10/20

A sample of nitrogen at a pressure of 1.00 atm and a temperature of 65.0 K is heated at constant pressure to a temperature of 88.8 K. Which of the following are true?
Choose all that applyThe sample is initially a liquid.The sample is initially a solid.The final state of the substance is a gas.The liquid initially present will solidify.One or more phase changes... more
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08/10/20

electrochemical series
30 min of electrolysis of solution of copper sulphate produces 3.175g of Cu. how many coulombs pass through the cell and what is the current
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08/10/20

a certain reaction proceeds three times faster at 585K than it did at 535K. Calculate the activation energy, in KJ/mol, for this reaction.
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08/10/20

Lewis Structure

7 Draw all the possible Lewis structures (resonance) for the following ion: SCN― Assign formal charges to each atom in each resonance structure Determine which Lewis structure is best... more
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08/10/20

Find the empirical formula

A compound containing carbon and hydrogen contains 4.75g of carbon and 0.80g of hydrogen. The molar mass of the compound is about 28g/mol.What is the empirical formula?
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08/07/20

What would be the best way to measure the moles of a reaction between calcium carbonate and sulfuric acid?
I know that I could measure the moles before and the moles after by doing the mass by the molar mass but Is there a better way to do this.
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08/06/20

Calculate the standard enthalpy of combustion of propane
Given the following data (1) C(s) + O2(g) ==> CO2(g) ΔHθ = -393 kJ/mol-1 (2) H2(g) + 1/2O2(g) ==> H2O(l) ΔHθ = -286 kJ/mol-1 (3) 3C(s) + 4H2(g) ==> C3H8(g) ΔHθ = -104 kJ/mol-1 Calculate... more
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08/05/20

Considering only ions with charges of +1, +2, -1 and -2, or neutral atoms, give the symbols for 4 species that are isoelectronic with the sulfide ion, S2-
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