Chemical reactions Calculators

Activation Energy Calculator A rate that doubles over ten degrees near room temperature implies about 53 kJ/mol — which is where the old rule comes from. Actual Yield Calculator What comes out of the flask after transfers, side reactions and losses on the filter paper. Arrhenius Equation Calculator Two rate constants at two temperatures are enough, because the pre-exponential factor cancels between them. Chemical Equation Balancer Solved as a nullspace in exact fractions, then re-counted element by element as a real check. Equilibrium Constant Calculator K and the standard free energy change are the same fact written two ways — a factor of ten is worth 5.7 kJ/mol. Kp Calculator The exponent is the change in moles of gas alone — solids and liquids never appear in it. Molar Ratio Calculator The coefficients of a balanced equation are the molar ratio — there is nowhere else it comes from. Percent Yield Calculator Above 100 percent means the product is wet or impure, not that the chemistry over-performed. pH Calculator One unit is tenfold — lemon juice at pH 2 is ten thousand times more acidic than coffee at pH 6. pOH Calculator pH + pOH = pKw, which is 14 only at 25 °C — neutral water at 50 °C sits at 6.6 and is still neutral. Rate Constant Calculator The barrier sits in an exponent, so a small change in it moves the rate by orders of magnitude. Reaction Quotient Calculator Q has the same form as K but is evaluated wherever you are now — comparing them says which way things move. Theoretical Yield Calculator Everything the balanced equation permits if every molecule of the limiting reactant converts.