What is a mole?

In simple words, "mole" is some measurement that helps to determine the molecular mass of an element. The Mole value is also called the Avogadro number. It is the standard value to measure all the elements to determine their atomic weight.

\begin{equation}

1 \text { Mole }=6.023^* 10^{\wedge} 23

\end{equation}

Formulas used to find the number of Moles

\begin{equation}

\text { Number of moles }=\text { Mass } / \text { Molecular mass }

\end{equation}

This formula can be used if mass is given; with the given mass, we could find the value of molar or molecular mass.

\begin{equation}

\text { Number of moles }=\text { Mass } / \text { Atomic mass }

\end{equation}

This formula can be used when the atomic mass of the given element is an atom.

\begin{equation}

\text { Number of moles }=\text { Number of atoms } / \text { Avogadro Number }

\end{equation}

This formula can be used if the number of atoms is given, thus we already knew the value of Avogadro number.

\begin{equation}

\text { Number of moles }=\text { number of molecules } / \text { Avogadro number }

\end{equation}

This is can be used if number of molecules is given

\begin{equation}

\text { Number of moles }=\text { Volume of STP } / \text { Molar volume }

\end{equation}

This could be used if the volume of STP (Standard Temperature and Pressure) of a gas is given.

How many moles are in Magnesium Phosphate?

Formula of Magnesium phosphate

\begin{equation}

\operatorname{Mg} 3(\mathrm{PO} 4) 2

\end{equation}

Thus, in a mole of Magnesium phosphate, there are 3 moles of Magnesium, 2 moles of phosphate. It could be easily deduced by the help of a formula.