Ethanol (c2h5oh) is produced from the fermentation of sucrose in the presence of enzymes. c12h22o11(aq) + h2o(g) 4 c2h5oh(l) + 4 co2(g) determine the theoretical yield and the percent yields of ethanol if 680. g sucrose undergoes fermentation and 326.5 g ethanol is obtained. theoretical _ g _ percent %

Ans: Theoretical yield = 365.8 g

% yield = 89.3%

Given reaction:

C12H22O11 + H2O → 4C2H5OH + 4CO2

Mass of sucrose = 680 g

Molar mass of sucrose = 342 g/mol

# moles of sucrose = 680/342 = 1.988 moles

Based on stoichiometry:

1 mole of sucrose forms 4 moles of ethanol

1.988 moles of sucrose will yield: 1.988*4 = 7.952 moles of ethanol

Molar mass of ethanol = 46 g/mol

Theoretical yield of ethanol = 7.952*46 = 365.8 g

% yield = (experimental/theoretical )*100 = (326.5/365.8)*100 = 89.3%

answer: option (4) is the correct answer.

explanation:

areas which are at low altitudes and near the equator tend to receive direct sunlight from the sun. hence, heat energy or radiations from the sun make these areas warmer and they have warmest water.

whereas areas which are at high altitudes and away from the equator do no receive direct sunlight. hence, no direct contact from the sun makes these regions colder and thus, they have colder water.

thus, we can conclude that the statement areas at low latitudes near the equator have the warmest water because they receive the most direct sunlight best explains the relationship between an area's geography and the temperature of its surface water.

the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

explanation: