15. How many molecules are in 6H2O?
To determine the number of molecules in a compound, you need to use Avogadro's number and the chemical formula of the compound. Avogadro's number is approximately 6.022 x 10^23 and represents the number of particles (atoms, molecules) in one mole of substance.
In the chemical formula 6H2O, the subscript '6' represents the number of moles of water. The subscript '2' in H2O represents the number of hydrogen atoms, and there are two hydrogen atoms in each water molecule.
To calculate the number of molecules, you need to multiply the number of moles by Avogadro's number. In this case, since there are 6 moles of water (H2O), you would multiply 6 by Avogadro's number.
Number of molecules = (Number of moles) x (Avogadro's number)
Number of molecules = 6 x 6.022 x 10^23
Number of molecules = 3.6132 x 10^24