Calculate the number of moles in 8.00 g of he

2 moles

Explanation:

Mole:

Mole is the unit of amount in chemistry. It is SI unit and represented by "mol".

Example:

one mole of hydrogen has a mass of 1.008 g and contain 6.022× 10∧23  atoms.

Steps to find the number of moles:

1. If the number of grams are given then to find out the moles first of all we will find the molar mass of given chemical substance.

For example:

If the given chemical substance is NaOH then its molecular weight is determine through following way:

atomic mass of Na=  1×22.989 g/mol

                                        +

atomic mass of oxygen= 1×16 g/mol

                                         +

atomic mass of hydrogen= 1× 1.008 g/mol

molecular mass of NaOH=  39.97 or 40 g/mol

2. when the molar mass and grams are known then number of moles are determine through following formula:

number of moles= mass in gram/ molar mass (g/mol)

Given data:

Now we will put the values in formula,

number of moles= 8.00g/4 g/mol

number of moles= 2 mol