Chemistry Questions & Answers

The molar entropies of \( \mathrm{HI}(\mathrm{g}) \) and \( \mathrm{I}(\mathrm{g}) \) at 298 K are 206.5 114.6 , and \( 180.7 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1} \) respectively. Using the \( \Delta \mathrm{G}^{\circ} \) given below, calculate the bond energy of HI . \( \mathrm{HI}(\mathrm{g}) \longrightarrow \mathrm{H}(\mathrm{g})+\mathrm{I}(\mathrm{g}) ; \Delta \mathrm{G}^{\circ}=271.8 \mathrm{~kJ} \) \( \begin{array}{ll}\text { (a) } 282.4 \mathrm{~kJ} \mathrm{~mol}^{-1} & \text { (b) } 298.3 \mathrm{~kJ} \mathrm{~mol}^{-1} \\ \text { (c) } 290.1 \mathrm{~kJ} \mathrm{~mol}^{-1} & \text { (d) } 315.4 \mathrm{~kJ} \mathrm{~mol}^{-1}\end{array} \)

Which pair of chemicals is capable of forming a buffer solution? (A) HCl and NaCl (B) \( \mathrm{HNO}_{2} \) and KNO 2 (C) KCl and NaF (D) HBr and \( \mathrm{NH}_{3} \)

Questions Check Answers How many milliliters of a 6.0 M HCl solution will provide 164 g of HCl ? Answer: 750 mL of HCl solution

A 28.95 mL sample of HCl of unknown concentration is transferred to a flask, where a few drops of indicator solution are added. The solution is titrated with 1.9 M NaOH . After 11.5 mL are added, the indicator turns pink, showing that the equivalence point has been reached. Calculate the molarity of the acid.

Question 8 What is the pH of a solution with \( \mathrm{pOH}=8.13 \) ? Add your answer

Buttermilk is the example of homogeneous or heterogeneous mixture?

Write the balanced chemical equation for the reaction of khp with naoh.

What is the concentration of \( \mathrm{H}+ \) ions in a solution with a pH of 12.84 ? Enter your answer in scientific notation to be recognized by autograding. For example: \( 8.4 \times 10-9 \) should be entered as " \( 8.4 \mathrm{e}-9 \) " in Blackboard. Add your answer

Calcular el calor de reacción entre el ácido sulfúrico con hidróxido de sodio e hidróxido de amonio, y del ácido nítrico con hidróxido de amonio e hidróxido de sodio. Tenga en cuenta que entra un flujo de 10L/min del ácido a una concentración de 1,5M

Consider the following reaction: \( \mathrm{NH}_{4}^{+}+\mathrm{CN}^{\cdot} \Leftrightarrow \mathrm{NH}_{3}+\mathrm{HCN} \) Which pair of substances represents a conjugate acid-base pair? Select all that apply. (A) \( \mathrm{NH}_{4}+ \) and CN - (B) \( \mathrm{NH}_{3} \) and HCN (D) \( \mathrm{NH} 4+ \) and NH 3 and HCN