ЗАДАЧИ 91-100 | Целевой экзамен по химии

To register for classes and for information on courses and answers to the target exam, write to @himia_repetitor in direct. 91. The hydrolysis of sucrose yielded 27.0 g of a mixture of glucose and fructose. Indicate the mass of sucrose that was hydrolyzed. 92. 40 dm³ of 96% (by mass) ethyl alcohol (density 0.8 kg/dm³) was obtained from sawdust. Determine the volume (normal conditions) of carbon dioxide released during this process. 93. The starch content of potatoes is 20%. The total yield of ethanol from potatoes is 60%. Indicate the mass of ethanol that will be obtained from 162 kg of potatoes. 94. The average number of glucose residues in a macromolecule of a cellulose sample is 6000. Indicate the average relative molecular mass of the cellulose sample. 95. Determine the mass of glucose that can be obtained from 324 kg of starch if the product yield is 75%. 96. Determine the mass of fructose formed during the hydrolysis of 68.4 g of sucrose if the product yield is 90%. 97. A gaseous mixture of methane and methylamine with a volume of 5.6 dm3 (normal conditions) was passed through an excess of hydrochloric acid. The mass of the solution increased by 4.65 g. Indicate the relative density relative to air of the original gas mixture. 98. Determine the volume of gaseous products formed during the combustion of 11.2 dm3 of methylamine (normal conditions). 99. The reduction of 246 g of nitrobenzene yielded 128 g of aniline. Determine the yield of aniline (%). 100. A study of the structure of a certain tripeptide revealed that the N-terminal amino acid residue in its molecule is alanine. Complete hydrolysis of 32.55 g of this peptide requires 5.40 g of water. Determine the probable primary structure of the tripeptide.