Question

what is the mass of 7.50 moles of CaO?

Answer 1

Mass of 1 mole cao=40+16=56

Mass of 7.50 moles= 7.50*56
=420g

Thanks for asking

Answer 2

420 grams of CaO is present in 7.5 moles of CaO.

Step-by-step explanation:

Given: 7.50 moles of CoO

To find: mass of CaO

Formula to be used: number of moles = given mass/molar mass

Step 1 of 1

The number of moles of a substance is calculated by dividing the given mass (w) of the substance by its molar mass (m).

The molar mass of a substance is evaluated by adding the mass of each atom present in the substance. Its unit is g/mol.

The molar mass of CaO is:

=atomic mass of Calcium + atomic mass of oxygen

=40 + 16

=56 g/mol

The mass of CaO in 7.50 moles of CaO will be:

$n=\frac{w}{m} \\\\7.50=\frac{w}{56} \\\\w=7.50*56\\\\w=420g$