Answer is: Ka for propanoic acid is 6,57·10⁻⁵. Chemical reaction: C₂H₅COOH(aq) + H₂O(l) ⇄ C₂H₅COO⁻(aq) + H₃O⁺(aq). n(C₂H₅COOH) = 0,04 mol. V(C₂H₅COOH) = 750 mL = 0,75 L. c(C₂H₅COOH) = 0,04 mol ÷ 0,75 L. c(C₂H₅COOH) = 0,053 mol/L = 0,053 M. [C₂H₅COO⁻] = [H₃O⁺] = 1,84·10⁻³ M = 0,00184 M.<span>
[HCN] = 0,053 M - 0,00184 M = 0,0515 M.
Ka = [</span>C₂H₅COO⁻] ·
[H₃O⁺] / [C₂H₅COOH]. Ka = (0,00184 M)² / 0,0515 M. Ka = 6,57·10⁻⁵.
AT, STP in chemistry is the abbreviation for Standard Temperature and Pressure. STP most commonly is used when performing calculations on gases, such as gas density
The reaction formula of this is N2 + 3H2 = 2NH3. So the ratio of mol number of N2 and NH3 is 1:2. The mol number of NH3 is 2.27*2=4.54 mol. So the mass is 4.54*17=77.18 g.
