- What is the energy of a photon emitted by the transition from the ni=4 nf=2 of a hydrogen atom?

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How do I solve this graphically and draw a graph?
(x-1)^2 +5 =6? If 990. mL of water is added to 10.0 mL of 0.10 M HCl, what is the pH of the resultant solution? Prove that if p|n and q|n, them pq|n. Every integer n>1 has a prime factor? How do we know that biologically separate races no not exist? Phosphoric acid, is a triprotic acid, for which Ka1= 7.2×10^-3, Ka2 = 6.3×10^-8 and Ka3 = 4.2×10^-13. What is the value of Kb for PO43-?