Question 30The two steps of the Vitamin D synthesis are summarized below. Step 1: 7-dehydrocholesterol + UV light ⇒ previtamin D3ΔG = -134 kJ/molStep 2: previtamin D3 ⇒ cholecalciferol (Vitamin D)ΔG = +58 kJ/mol What is ΔG for Vitamin D synthesis? A.-192 kJ/molB.-76 kJ/molC.+76 kJ/molD.+192 kJ/mol
Question
Question 30The two steps of the Vitamin D synthesis are summarized below. Step 1: 7-dehydrocholesterol + UV light ⇒ previtamin D3ΔG = -134 kJ/molStep 2: previtamin D3 ⇒ cholecalciferol (Vitamin D)ΔG = +58 kJ/mol What is ΔG for Vitamin D synthesis? A.-192 kJ/molB.-76 kJ/molC.+76 kJ/molD.+192 kJ/mol
Solution
The ΔG for the synthesis of Vitamin D can be calculated by adding the ΔG of each step.
For Step 1, ΔG = -134 kJ/mol For Step 2, ΔG = +58 kJ/mol
So, the total ΔG for the synthesis of Vitamin D is -134 kJ/mol + 58 kJ/mol = -76 kJ/mol.
Therefore, the correct answer is B. -76 kJ/mol.
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