RVHS Empirical/Molecular Formulas and Hydrates

Front

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

Back

C₆H₁₂O₆

Front

What is the definition of an empirical formula?

Back

A formula with the lowest whole number ratio of elements in a compound.

Front

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

Back

It becomes anhydrous.

Front

How do you calculate the empirical formula from mass percentages of elements?

Back

Convert mass percentages to grams, then to moles, and find the simplest whole number ratio.

Front

What is the empirical formula of a compound containing 0.473 g of nitrogen, 33.8% carbon, and 1.41% hydrogen by mass?

Back

C₂HNO₂

Front

What is the formula of a hydrate of magnesium carbonate that loses water when heated?

Back

MgCO₃ · 5H₂O

Front

What is the difference between empirical and molecular formulas?

Back

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

Front

What is the significance of molar mass in determining molecular formulas?

Back

Molar mass helps to determine how many times the empirical formula fits into the molecular formula.

Front

What is a hydrate?

Back

A compound that contains water molecules within its structure.

Front

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

Back

Dehydration.