You are given a `2.18g` sample containing a mixture of XO and `X_2O_3`. It takes 0.015 " mol of "`K_2Cr_2O_7` to oxdise the sample completely to form `XO_4^(ɵ)` and `Cr^(3+)`. If 0.0187 " mol of "`XO_4^(ɵ)` is formed, what is the atomic mass of X?

Explanation

To solve the problem step by step, we will follow the stoichiometric relationships and the information given in the question.

### Step 1: Define Variables
Let:
- \( A \) = moles of \( XO \)
- \( B \) = moles of \( X_2O_3 \)

### Step 2: Write the Reactions
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