Can someone solve these and give steps?

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?

Which formula can be used to calculate the molar mass of hydrogen peroxide

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom