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.

The energy for 1 mole of these photons is E = 31 ×  

Explanation:

Given data

Wavelength 639.8 × m

Plank constant h = 6.626 × J sec

Speed of light c = 3 × meter per second

We know that Energy  of a photon is given by

Value of ( h c ) = 6.626 ×  × 3 × = 19.878 ×

639.8 × m

Now Energy  of a photon

E = 0.031 × Joule per mole

E = 31 ×  

Therefore the energy for 1 mole of these photons is E = 31 ×  

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explanation:

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.