Using dimensional equations convert 500 m^/(day.kg) to cm^/(s.g). problem 1.2: you have given: u = uo+gt; here u = m/s, uo = ft/min, g = m/s2, t=hr is the equation valid? convert it to dimensionally homogeneous and consistent equation. problem 1.3: calculate the weight in dynes of a 5 ton object (1 ton = 2000 lbm). express the result in scientific notation having 3 significant numbers.

The answer is explained below:

Explanation:

Given the chemical equation:

                   N2H4(g)+H2(g)→2NH3(g)

The standard enthalpy of formation is given by the following formula:

            ΔH^0 rxn = ∑ B reactants - ∑ product

       -187.78 kJ/mol = [( 1x B N-N) + (1 x B N-H ) + (1 x b H-H)] - [ 6 x B N-H]

       -187.78 kJ/mol = [( 1x B N-N)  +(4 x 391 kJ/mol) + (1 x 436  kJ/mol)] - [ 6x 391  kJ/mol ]

        -187.78 kJ/mol =  B N-N  + (1564 + 436 - 2346) kJ/mol

                                       B   = 158.22 kJ/mol

So, in this case the enthalpy of N-N bond is 158 kJ/mol