## Formulas For Determination Of Masses

The formula for mass determination in chemistry changes with the situation in which it is being used. some of the commonly used formulas for mas determination are given below:

Formula for calculating the

- mass of a substance:
- molecular mass of a compound:
- molar mass of a compound:
- percent composition

## Formula for calculating the mass of a substance:

Mass is a property of substance which give information about the matter,an object contain.it can be find out by using following formula;

mass = density x volume

where:

- mass is the quantity t of substance calculated in grams
- density is the density of the substance found in grams per cubic centimeter (g/cm^3)
- and volume is the volume of the substance checked in cubic centimeters (cm^3).

## Formula for calculating the molecular mass of a compound:

It is also known as molecular weight and can be defined as the addition of the atomic masses of all the atoms in a molecule. The formula to calculate molecular mass of a compound is given below

molecular mass = addition of the atomic masses of all atoms in the compound

Here:

- the atomic masses are commonly taken from the periodic table
- and are determined in atomic mass units (amu).

## Formula for calculating the molar mass of a compound:

The term molar mass denoted by (M),and can be defined **as the**

* “ratio among the mass and the amount of substance (measured in moles) of any sample”*. The formula used to determine the molar mass of a compound is given below

molar mass = molecular mass / number of moles

Where:

- the molecular mass is checked in grams per mole (g/mol) and
- the number of moles is the quantity of substance given in moles.

## Formula for calculating the percent composition:

The percentage composition of a given compound is defined as the ratio of the amount of each element to the total amount of individual elements present in the compound multiplied by 100.its formula is given below

percent composition = (mass of element in compound / total mass of compound) x 100%

in this formula:

- the mass of the element in the compound is calculated in grams
- and the total mass of the compound is also calculated in grams.