when 25.215g of a mixture of substances X, Y and Z was separated, 7.52g of X and 8.48g of Y was recovered. assuming that there was no loss of components during the separation process, calculate the percentage by mass of Z in the mixture.​

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 %

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!