Question

How many copper atoms are in 5.6 moles of $C{{u}_{2}}O$?

Answer 1

Hint: The answer here is based on the basic concept of general chemistry which deals with fact about the Avogadro law and the Avogadro constant which says that one mole of any substance contains a constant number of atoms. Find the constant value and multiply it with the number of moles of copper.

Complete step by step answer:
The concept of general chemistry which deals with the chapter called as some basic concepts of chemistry, tells us about the mole, molecule and atoms and their masses along with it and we are familiar with these concepts.
We shall now see what one molecule of substance is and how can it be determined by taking one instance of a chemical reaction.
- According to the Avogadro law, mole concept that is one mole of a substance is defined as ‘the amount of a substance which contains as many elementary particles as that the number of carbon atoms present in 12 g of C – 12 isotope’.
- According to his law, one mole of substance contains $6.023\times {{10}^{23}}$ number of atoms which he obtained by the actual law that he proposed which states that ‘equal volumes of different gases measured under same conditions of temperature and pressure contain same number of molecules’.
- The S.I. unit for this constant value is given as $mo{{l}^{-1}}$ and is defined by the symbol ‘N’ or ‘NA’.
Thus, there are 2 copper atoms in $C{{u}_{2}}O$ and the total number of moles of copper in this is,
\[2\times 5.6\times 6.022\times {{10}^{23}}=6.74\times {{10}^{24}}\] atoms of $Cu$
Thus, there are \[6.74\times {{10}^{24}}\] number of atoms in 5.6 moles of $C{{u}_{2}}O$

Note: Note that the Avogadro number is the constant that is the proportionality factor which relates the number of constituent particles in a sample with the amount of the substance in that sample.