Photo AI

Which reaction has an enthalpy change equal to the standard enthalpy of formation of silver iodide? A) AgI(g) + rac{1}{2} I_2(g) → AgI(s) B) Ag(s) + rac{1}{2} I_2(s) → AgI(s) C) Ag^+(g) + I^-(g) → AgI(s) D) Ag^+(aq) + I^-(aq) → AgI(s) - AQA - A-Level Chemistry - Question 9 - 2020 - Paper 3

Question 9

$Which-reaction-has-an-enthalpy-change-equal-to-the-standard-enthalpy-of-formation-of-silver-iodide?--A)-AgI(g)-+--rac{1}{2}-I_2(g)-→-AgI(s)--B)-Ag(s)-+--rac{1}{2}-I_2(s)-→-AgI(s)--C)-Ag^+(g)-+-I^-(g)-→-AgI(s)--D)-Ag^+(aq)-+-I^-(aq)-→-AgI(s)-AQA-A-Level Chemistry-Question 9-2020-Paper 3.png$

Which reaction has an enthalpy change equal to the standard enthalpy of formation of silver iodide? A) AgI(g) + rac{1}{2} I_2(g) → AgI(s) B) Ag(s) + rac{1}{2} I_... show full transcript

Worked Solution & Example Answer:Which reaction has an enthalpy change equal to the standard enthalpy of formation of silver iodide? A) AgI(g) + rac{1}{2} I_2(g) → AgI(s) B) Ag(s) + rac{1}{2} I_2(s) → AgI(s) C) Ag^+(g) + I^-(g) → AgI(s) D) Ag^+(aq) + I^-(aq) → AgI(s) - AQA - A-Level Chemistry - Question 9 - 2020 - Paper 3

Step 1

B) Ag(s) + rac{1}{2} I_2(s) → AgI(s)

96%

114 rated

Answer

The standard enthalpy of formation for a compound is defined as the enthalpy change when one mole of the compound is formed from its elements in their standard states. In this case, option B represents the formation of silver iodide from solid silver and iodine gas, which gives the correct enthalpy change corresponding to the formation of AgI. Hence, this reaction is the correct choice.

Join the A-Level students using SimpleStudy...

97% of Students

Report Improved Results

98% of Students

Recommend to friends

100,000+

Students Supported

1 Million+

Questions answered

;