Find the mass of urea (CH4N2O) needed to prepare 48.1 g of a solution in water in which the mole fraction of urea is 7.58×10−2. Express your answer with the appropriate units.

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.