It should be <em>Ultraviolet rays </em>because they are moderate in energy.
(3) the forward reaction rate is equal to the reverse reaction rate
hope this helps!
All acids contain OH in their formula
1mol ------------ 3×6,02×10²³ oxygen atoms
x ------------ 2,55×10²⁴
x = 2,5×10²⁴ × 1mol / 3×6,02×10²³ ≈ 0,138*10 mol = 1,38mol
