Question

How do you convert grams to mole?

Answer 1

Hint: In order to this question, to convert grams to mole, we must divide the molar mass of the substance. And then we will take an example and show how grams are converted into moles. We will discuss more about it.

Complete step by step solution:
To convert from grams to moles, you must divide the molar mass of the substance.

For example, water has a molar mass of \[18{\text{ }}g/mol\] . Therefore, a \[25{\text{ }}g\] sample of water contains-
$\therefore \dfrac{{25g}}{{18\dfrac{g}{{mol}}}} = 1.39mol\,of\,water\,molecules$
Note that the unit of grams is written as $g$ , and the unit of moles is written as \[mol\] .

Once you’ve done that, you need to determine how much the compound weighs physically (in grams). After you get both of these values, you need to divide the physical weight of the compound by its molecular weight.

Note:
To convert the grams into moles, divide the mass of the substance by the molecular weight. In other words, it is the ratio of the mass of the substance to its molecular weight. This conversion helps to determine the number of moles that are in the specified mass of the substance. Thus, the conversion of grams to moles formula is: \[Moles = \dfrac{{Mass{\text{ }}of{\text{ }}the{\text{ }}substance{\text{ }}(in\;grams){\text{ }}}}{{Molecular\,weight}}\] .