Question

What is the mass of 5.6 x 1026 molecules of Al2O3?

Answer 1

`94,883.72\text{ g}`

Step-by-step explanation:

Here, we want to get the mass that contains the given number of molecules

We start by getting the number of moles

Mathematically:

`1\text{ mole has 6.02 }*\text{ 10}^(23)\text{ molecules}`

The number of moles in the given number of molecules would be:

`\frac{5.6\text{ }*\text{ 10}^(26)}{6.02\text{ }*\text{ 10}^(23)}\text{ = 930.23 moles}`

Now from here, we get the mass

Mathematically:

`mass\text{ = number of moles }*\text{ molar mass}`

The molar mass of the compound is 102 g/mol

Thus, we have the mass as:

`930.23\text{ }*\text{ 102 = 94,883.72 g}`