Convert 3.30 g of copper (II) hydroxide Cu(OH)2 to molecules.

0.18× 10²³ molecules

Explanation:

Given data:

Mass of copper hydroxide = 3.30 g

Number of molecules = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 3.30 g/97.56 g/mol

Number of moles = 0.03 mol

Avogadro number:

The given problem 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.

1 mole = 6.022 × 10²³ molecules

0.03 mol × 6.022 × 10²³ molecules / 1mol

0.18× 10²³ molecules

1) MgO + 2HBr -> MgBr2+H2O

2)2N2+5O2->2N2O5

3)C2H4+2O2->CO2+2H2O

4)Fe+2HCl->FeCl2+H2