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One of the most important enzymes in the
Chapter 11, Problem 79P(choose chapter or problem)
Problem 79P
One of the most important enzymes in the world—nitrogenase, the plant protein that catalyzes nitrogen fixation—contains active clusters of iron, sulfur, and molybdenum atoms. Crystalline molybdenum (Mo) has a body-centered cubic unit cell (d of Mo = 10.28 g/cm3). (a) Determine the edge length of the unit cell, (b) Calculate the atomic radius of Mo.
Questions & Answers
QUESTION:
Problem 79P
One of the most important enzymes in the world—nitrogenase, the plant protein that catalyzes nitrogen fixation—contains active clusters of iron, sulfur, and molybdenum atoms. Crystalline molybdenum (Mo) has a body-centered cubic unit cell (d of Mo = 10.28 g/cm3). (a) Determine the edge length of the unit cell, (b) Calculate the atomic radius of Mo.
ANSWER:
Solution 79P
Here we have to determine the edge length of the unit cell and the atomic radius of Mo.
Crystalline molybdenum (Mo) has a body-centered cubic unit cell (d of Mo = 10.28 g/cm3).
Step 1
(a) Here we have to determine the edge length of the unit cell.
Crystalline molybdenum (Mo) has a body-centered cubic unit cell
density of Mo = 10.28 g/cm3
Edge unit cell can be calculated as follows,
Edge unit cell =
= 3.141 10-8 cm
Thus the edge length of the unit cell is found to be 3.1410-8 cm.