Question

Calculate the number of moles in 81 gram of aluminium

Answer 1

Answer: The number of moles of aluminium are 3 moles.

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

We are given:

Given mass of aluminium = 81 g

Molar mass of aluminium = 26.98 g/mol

Putting values in above equation, we get:

$\text{Moles of aluminium}=\frac{81g}{26.98g/mol}=3mol$

Thus, the number of moles of aluminium are 3 moles.

Answer 2

Answer:

There are 3 moles in 81 grams of aluminum.

Explanation:

Given:

Mass of the aluminum is 81g

To find:

The number of moles of aluminum in 81g

We know that,

Number of moles=given mass/molar mass ……………exp1

From the given above statement,

The given mass of the aluminum =81g

We know that the molar mass of aluminum=26.98g/ml                  

Now, substitute the known values in the exp1

We get,

Number of moles=81/26.98

=3