Calculate the number of C atoms in 11g of carbon dioxide

1.51× 10²³ C atoms

Explanation:

Given data:

Mass of CO₂ = 11 g

Number of atoms in 11 g of CO₂  = ?

Solution:

First of all we will calculate the number of moles of CO₂ .

Number of moles = mass/ molar mass

Number of moles = 11 g/ 44 g/mol

Number of moles = 0.25 mol

One mole of  CO₂ contain 1 mole of C atom.

0.25 mole of CO₂ contain 0.25 moles of C atom.

The number of C atoms in 0.25 moles will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number .

11 g of CO₂ = 0.25 moles of C = 0.25 × 6.022 × 10²³ C atoms

1.51× 10²³ C atoms

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !