Zadanie 3a
State the name of the reagent that is heated with propanoic acid to form this ester.
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State the name of the reagent that is heated with propanoic acid to form this ester.
A student heated 3.85 g of propanoic acid with an excess of the second reagent and isolated 3.12 g of the ester. Determine the percentage yield.
The conversion of propanoic acid into the ester can be followed by changes in spectra. (i) Compare the infrared (IR) spectra of propanoic acid and of the ester between 1500 and 3500 cm−1 by stating one feature they share and one feature in which…
State the class of organic compounds to which CH3CH2COOCH3 belongs.
Graphite foil is made of many layers of carbon atoms stacked on top of each other. It is used to spread heat away from the processor of a mobile phone because it conducts heat well parallel to the layers but poorly perpendicular to them. Suggest why graphite…
Nomex is a synthetic fibre used in fire-resistant clothing. It is a polyamide formed from the two monomers shown. Draw one repeating unit of Nomex.
Thallium (Ar = 204.38) consists of two stable isotopes, and . What is the relative abundance of ? A. 31 % B. 38 % C. 62 % D. 69 %
(i) Calculate the enthalpy change of this reaction using section 13 of the data booklet together with the values given below: (ii) Outline why the entropy change of this reaction is expected to be small. (iii) Ignoring any entropy change, estimate the…
Deduce the molecular geometry of COS and of H2S, and state why the two geometries differ.
Naturally occurring sulfur is a mixture of several isotopes. A sample was enriched in , giving the following composition: (i) Calculate the relative atomic mass of the enriched sample to two decimal places. (ii) The abundance of…