How many grams of excess reactant will remain after the reaction of 12.5 g of Cao and 75.0 g of `HCIO_4` ?

Explanation

To determine how many grams of the excess reactant will remain after the reaction of 12.5 g of CaO and 75.0 g of HClO4, we can follow these steps:

### Step 1: Write the balanced chemical equation
The balanced reaction between calcium oxide (CaO) and perchloric acid (HClO4) is:
\[ \text{CaO} + 2 \text{HClO}_4 \rightarrow \text{Ca(ClO}_4\text{)}_2 + \text{H}_2\text{O} \]

### Step 2: Calculate the molar masses
- Molar mass of CaO:
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