How many moles of ar are in 1.27x10^24 ar atoms?

1 mole Ar 6.02x10²³ atoms
?? moles Ar 1.27x10²⁴ atoms

1.27x10²⁴ x 1 / 6.02x10²³ => 2.109 moles of Ar

hope this helps!

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

Determine the  wavelength of light emitted when an electron  in an li2+ ion  makes a transition from an orbital with n  =  6 to an orbital with n  = 5.