A laser is emitting photons with a wavelength of 639.8 nm. What is the energy for 1 mole of these photons? For Planck's constant, use a value of 6.626x10-34 J s. Use units of kJ/mol. Report just the number, not the units.

Examine the false statement. compounds are the smallest unit of an element that occur most commonly in nature. select the rewording of the statement that is true. a: atoms are the smallest unit of an element that commonly occur in nature. b: molecules are the smallest unit of an element or compound that commonly occur in nature. c: molecules are the smallest unit of a compound that occur on the periodic table. d: compounds are the smallest unit of an element that occur on the periodic table