Organic Chemistry Answers

Dilution of B1

Initial burette reading/cm³ - 0.00

Final burette reading/cm³- 30.00

What is the Volume of B1/cm³?

Titration of B2 with A1

Initial burette reading/cm³ - (1)0.00 (2)0.00 (3)0.00

Final burette reading/cm³ - (1)24.00 (2)23.10 (3) 23.65

1. Find the number of moles of Na₂Co₃ in 25cm³ of B2.
2. Calculate the number of moles of Na₂Co₃ in 250cm³ of B2.
3. Calculate the concentration of, in mol dm³, of Na₂Co₃ in B1.
4. Calculate the concentration, in g dm^-3, of Na₂Co₃ in B1.
5. Calculate the percentage by mass of Na₂Co₃ in B1.

Equation:

Na2CO3 [aq] + 2HCl[aq] ------> 2NaCl [aq] + CO2 [g] + H2O [l]

What could be the name of compound with general formulae of R-O-R

Does the volume of water in the beacher during crystallization have a great influence on the yield of the product? Why.

how many sigma and pi bond(carbon only) does ibuprofen, naproxen and paracetamol have?

The number of pie bonds in propadiene is

Marble (calcium carbonate) reacts with an excess hydrochloric acid solution according to the following chemical equation:

CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l)

What is the percentage yield of carbon dioxide if 3,65 g of the gas is collected when 10 g of the marble reacts?

An excess of dilute sulphuric acid reacts with 20 g of impure iron. The following reaction occurs:

Fe + H2SO4 → FeSO4 + H2

In the reaction which occurs, 5,6 dm3 of hydrogen gas is liberated at STP. Calculate the percentage purity of the iron.

What is the volume of 0.0125M hydrogen bromide solution is required to titrate 125ml of a 0.010M calcium hydroxide solution

Ethanol burns completely in oxygen, producing carbon dioxide and water vapour. The molar enthalpy of combustion of ethanol in these conditions is -1234.8 kJ/mol. Determine the molar enthalpy of formation of ethanol.

Ethanol burns completely in oxygen, producing carbon dioxide and water vapour. The molar enthalpy of combustion of ethanol in these conditions is -1234.8 kJ/mol. Determine the molar enthalpy of formation of ethanol.