Conversions (Mass-Mole-Particles) & Percent Comp.

Front

What is the empirical formula?

Back

The empirical formula is the formula of a compound that shows the simplest whole-number ratio of the elements in the compound.

Front

What is the molar mass of a substance?

Back

The molar mass is the mass in grams of one mole of any pure substance.

Front

How do you calculate percent composition?

Back

Percent composition is calculated by dividing the mass of each element in a compound by the total mass of the compound and multiplying by 100.

Front

What is the molecular formula?

Back

The molecular formula shows the actual number of atoms of each element in a molecule of a compound.

Front

What is the difference between empirical and molecular formulas?

Back

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

Front

How do you determine the empirical formula from mass data?

Back

Convert the mass of each element to moles, divide by the smallest number of moles, and use the resulting ratios to write the empirical formula.

Front

What is the formula for calculating moles from mass?

Back

Moles = mass (g) / molar mass (g/mol).

Front

What is the significance of percent composition in chemistry?

Back

Percent composition helps in understanding the composition of a compound and is useful in stoichiometric calculations.

Front

How do you find the percent composition of carbon in magnesium carbonate (MgCO3)?

Back

Percent composition of carbon = (mass of carbon in formula / molar mass of MgCO3) x 100.

Front

What is the relationship between moles and particles?

Back

1 mole of any substance contains 6.022 x 10^23 particles (Avogadro's number).