Determine the pH of a 0.62 M NH_4NO_3 solution at 25 degree C. The K_b for NH3 i

Question

Determine the pH of a 0.62 M NH_4NO_3 solution at 25 degree C. The K_b for NH3 is 1.76 Times 10^-5 9.27 2.48 4.73 11.52 9.45 Estimate delta G degree_rTimesn for the following reaction at 449.0 K. CH_2O(g) + 2 H_2(g) rightarrow CH_4(g) + H_2O(g) deltaH degree = 94.9 kJ; delta S degree = -224.2 J/K +5.8 kJ +12.9 kJ +2.4 kJ -4.2 kJ +101 kJ Given the following equation, H_2O(g) + CO(g) rightarrow H_2(g) + CO_2(g) delta G degree_rTimesn = -28.6 kJ Calculate delta G degree_rxn for the following reaction. 5 H_2O(g) + 5 CO(g) rightarrow H_2(g) + 5 CO_2(g) -143.0 kJ +5.72 kJ -5.72 kJ +143.0 kJ -28.6 kJ What is the pH of pure water at 40.0 degree C if the K_w at this temperature is 2.92 Times 10^-14? 7.233 8.446 0.465 7.000 6.767 Which of the following acids will have the strongest conjugate base? HCl HCN HNO_3 HClO_4 Hl

Explanation / Answer

15. the ans is HCN as HCN is weakest one among these so it has strongest conjugate base.

13. as G is extensive property so the ans is multiplied by 5 of the actual value that is -143 kj

11. the equation is

PH= PKW - 1/2 log 0.62 - 1/2 log(1.76 x 10-5)

12. the equation is delG = del H - T del S

= -94900 + 449X 224.2

= 5.8 KJ

14. Kw = H+ X OH-

AS THE CONCENTRATIONS ARE SAME SO

kW = H+2

2.92X 10-14 = H+2

CALCUATING CONC OF H+ ONE CALCUALTE PH

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