Answer:
[tex]x= 1.070*10^{21}[/tex] molecules.
Explanation:
1 mole of any compound contains, approximately, 6.022 * 10^23 molecules. Now, we need to find out how much is the mass of a mole of H₂O.
1. First of all, we need to find count the atoms of all the elements in this formula.
H (hydrogen): 2 atoms.
O (oxygen): 1 atom.
2. Using the periodic table, find the molar mass of each element.
H (hydrogen): 1.008u.
O (oxygen): 15.999u.
3. Multiply the molas mass by the number of atoms.
H (hydrogen): (1.008u)(2)=2.016.
O (oxygen): (15.999u)(1)=15.999.
4. Calculate the molar mass of the compound.
15.999+2.016= 18.015 g/mol.
5. Now that we know how much a mole of H₂O, and that a mole equals 6.022 * 10^23 molecules we can state the following:
18.015 g of H₂O= 1 mole= 6.022 * 10^23 mmolecules.
6. Use the data from the previous subtitle to stablish a rule of 3.
18.015 g of H₂O --------- 6.022 * 10^23 mmolecules
0.032 g of H₂O --------- x
x= (0.032 * 6.022 * 10^23) / 18.015
[tex]x= 1.070*10^{21}[/tex] molecules.
