Question

How many moles are in \[360g\] of glucose, ${{C}_{6}}{{H}_{12}}{{O}_{6}}$ ? How would I be able to find the answer to this problem? The molar mass of the compound is $180.01gmo{{l}^{-1}}$ .

Answer 1

Hint: Mole concept gives the relationship between the number of moles, weight and molar mass of the compound. Molar mass is calculated by adding up the atomic masses of the element combined to form a molecule.

Complete solution:
A mole is defined as a scientific unit which is used to measure large quantities of atoms and molecules. It is defined as the amount of substance present in a sample.
$1mole=6.022\times {{10}^{23}}particles$
This is also called Avogadro's number $\left( {{N}_{A}} \right)$ .
molar mass is defined as the addition of atomic mass of atoms, combined in a molecule. Here, the molar mass of ${{C}_{6}}{{H}_{12}}{{O}_{6}}$ is $180.01gmo{{l}^{-1}}$ .
In this question, it is given that the weight of the glucose is $360g$
The molar mass of glucose is $180.01gmo{{l}^{-1}}$
We use mole formula to calculate the no of moles present in glucose,
$n=\dfrac{w}{m}$
Where, $n$ is the number of moles, $w$ is the weight of the compound and $m$ is the molar mass of the compound.
Now substituting the value in the given formula we get,
$n=\dfrac{360}{180.01}$
$n=1.99moles$

The number of moles in $360g$ of glucose is $1.99moles$.

Additional information: Moles are defined as the weight of the compound per molar mass of the compound.
Formula mass is different from molecular mass. In formula mass, there is an addition of atomic masses of ions present in an ionic compound, whereas molecular mass is the addition of atomic masses of the atoms in a molecule.

Note: The molar mass is calculated in $gmo{{l}^{-1}}$ .
We should know how to calculate molar mass of a compound and then substitute the values in the mole concept formula.