How many molecules of CH40 are in 22.0 g of CH40?

4.03 × 10²³ molecules

Explanation:

Given data:

Mass of CH₄O = 22.0 g

Number of molecules = ?

Solution:

Number of moles of CH₄O:

Number of moles = mass/molar mass

Number of moles = 22.0 g/ 33 g/mol

Number of moles = 0.67 mol

Number of molecules:

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

0.67 mol  × 6.022 × 10²³ molecules  / 1 mol

4.03 × 10²³ molecules

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.