Organic Chemistry Answers

Which of the following is true with regard to a 0.05M H2SO3 solution?

If you used 0.253 g of salicylic acid and 4.0 mL of ethanol and it resulted in a yield of 0.234 g of pure ethyl salicylate, what is the percent yield of the reaction? Show your work. (The ethanol we use is a pure liquid with a density of 0.789 g/mL)

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