Calculate the following quantities: (d) number of O atoms in 6.25⨉10⁻³ mol Al(NO₃)₃

Verified step by step guidance

1. Identify the chemical formula of the compound: Al(NO_3)_3.
2. Determine the number of oxygen atoms in one formula unit of Al(NO_3)_3. Each NO_3 group contains 3 oxygen atoms, and there are 3 NO_3 groups, so there are 3 * 3 = 9 oxygen atoms per formula unit.
3. Use Avogadro's number (6.022 x 10^23) to find the number of formula units in 6.25 x 10^-3 mol of Al(NO_3)_3. Multiply the number of moles by Avogadro's number to get the number of formula units.
4. Multiply the number of formula units by the number of oxygen atoms per formula unit to find the total number of oxygen atoms.
5. Ensure all units are consistent and check calculations for accuracy.

Key Concepts

Mole Concept

The mole is a fundamental unit in chemistry that quantifies the amount of substance. One mole contains approximately 6.022 x 10²³ entities, such as atoms or molecules. Understanding the mole concept is essential for converting between the number of moles and the number of particles, which is crucial for solving stoichiometric problems.

Chemical Formula Interpretation

Chemical formulas represent the composition of compounds. For example, Al(NO₃)₃ indicates that one aluminum atom is bonded to three nitrate ions, each containing one nitrogen atom and three oxygen atoms. Interpreting chemical formulas allows us to determine the number of each type of atom present in a given amount of the compound.

Stoichiometry

Stoichiometry is the area of chemistry that deals with the relationships between the quantities of reactants and products in chemical reactions. It allows chemists to calculate the amounts of substances involved in reactions based on their chemical formulas. In this case, stoichiometry helps in determining the total number of oxygen atoms from the given moles of Al(NO₃)₃.