How many grams are in 0.750 mols of Na2C03?

What layer of the atmosphere is directly above the troposphere?

Freezing 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.

What does the symbol (–hfus) indicate in a phase change?