When nacl dissolves in water the change is endothermic yet when added to water it dissolves without energy.. how does this happen?

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 %

This drawing shows a human body system. what is the primary function of this body system?

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