what explanation can you give for the fact that considerably different speeds of diffusion were reported for methyl salicylate?

Idon’t know how to solve this question

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 %

What is the empirical formula for c4h8o2