Question

According to the mineralogical phase rule, the number of minerals that can coexist at equilibrium in a 8 component chemical system with 2 degrees of freedom is ..........

Hint:

The phase rule helps in determining the number of independent variables (such as temperature or pressure) that can be varied in a system while keeping others constant.

Answer 1

Correct Answer: 8

Step 1: Use the phase rule equation. 
The phase rule for a system with \( F \) degrees of freedom is given by: \[ F = C - P + 2 \] 

Where: 

- \( C = 8 \) (the number of components) 

- \( P \) is the number of phases 

- \( F = 2 \) (the degrees of freedom) 

Rearranging the equation to solve for \( P \): \[ P = C + 2 - F = 8 + 2 - 2 = 8 \] 

Thus, the number of minerals that can coexist at equilibrium in this system is 8.