Calcualte the percentage of cation in ammonium dichromate.

Explanation

To calculate the percentage of cation in ammonium dichromate \((NH_4)_2Cr_2O_7\), we will follow these steps:

### Step 1: Determine the formula of ammonium dichromate
The formula for ammonium dichromate is \((NH_4)_2Cr_2O_7\).

### Step 2: Identify the cations and anions
In this compound:
- The cation is the ammonium ion \((NH_4^+)\).
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