Answer the following questions in one word or one sentence:
What is `10H_(2)O` in `Na_(2)CO_(3)*10H_(2)O`?

Explanation

To answer the question regarding `10H_(2)O` in `Na_(2)CO_(3)*10H_(2)O`, we can follow these steps:

1. **Identify the Compound**: The compound is sodium carbonate with ten water molecules associated with it, represented as `Na_(2)CO_(3)*10H_(2)O`.

2. **Understand Water of Crystallization**: The `10H_(2)O` indicates that there are ten molecules of water that are part of the crystalline structure of sodium carbonate.

3. **Define the Term**: The term used to describe a compound that includes water of crystallization is "hydrate." Specifically, when there are ten water molecules, it is referred to as "decahydrate."

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