The mole fraction of zinc nitrate, Zn(NO3)2, in an aqueous solution is 5.49×10-2 .

The percent by mass of zinc nitrate in the solution is
%.

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

May someone me with these science questions

What is the mass of naoh that would have to be added to 500 ml of a solution of 0.20 m acetic acid in order to achieve a ph of 5.0?