RVHS Empirical/Molecular Formulas and Hydrates

Front

What is the empirical formula for a compound with 81.82% carbon and 18.18% hydrogen?

Back

C₃H₈

Front

What is the formula of the hydrate of magnesium carbonate if a 15.67 g sample loses 8.09 g of water upon heating?

Back

MgCO₃ · 5H₂O

Front

How do you determine the molecular formula from the empirical formula CH₂O and a molecular molar mass of 180.18 g/mol?

Back

C₆H₁₂O₆

Front

What happens to a hydrated salt when it is gently heated?

Back

It becomes anhydrous.

Front

What is a hydrate in terms of its crystalline structure?

Back

A salt with water molecules trapped in its crystalline structure.

Front

Define empirical formula.

Back

The simplest whole-number ratio of atoms of each element in a compound.

Front

What is the difference between empirical and molecular formulas?

Back

Empirical formula shows the simplest ratio of elements, while molecular formula shows the actual number of atoms in a molecule.

Front

How do you calculate the mass of water in a hydrate?

Back

Subtract the mass of the anhydrous compound from the mass of the hydrate.

Front

What is the significance of the number of water molecules in a hydrate's formula?

Back

It indicates how many water molecules are associated with each formula unit of the compound.

Front

What is the process of heating a hydrate to remove water called?

Back

Dehydration.