Calculate the number of atoms per cubic meter in aluminum. The density and atomic weight of aluminum are 2.70 g/cm3 and 26.98 g/mol respectively. The value of Avogadro's number is 6.022 x 1023 atoms/mol.

We have 6.026 *10^28 Al atoms per cubic meter

Explanation:

Step 1: Data given

The density and atomic weight of aluminum are 2.70 g/cm3 and 26.98 g/mol respectively.

The value of Avogadro's number is 6.022 * 10^23 atoms/mol

Step 2: Calculate the number of atoms / cubic meter

N = (Na * ρal) / Mal

⇒ with Na = the number of Avogadro = 6.022 * 10^23 atoms / mol

⇒ with ρal = the density of aluminium = 2.70 g/cm³

⇒with Mal = the atomic weight of aluminium = 26.98g/mol

N = (6.022*10^23 *2.70) / 26.98

N = 6.026 *10^22 atoms / cm³ = 6.026 *10^28 atoms / m³

We have 6.026 *10^28 Al atoms per cubic meter

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.