what do you use to clean quartz countertops ?
Quartz is SiO2 To calculate the number of atoms: 1) First calculate the moles of quartz (SiO2) moles = mass/ atomic mass = 2.1/ (28.1+16*2) = 2.1/60.1 = 0.035 2) The calculate the moles of O atoms 1 SiO2 -> 2 O so 0.035 *2 = 0.070 moles of O 3) Convert moles to molecules using Avogadro's number 0.070 moles * 6.022 x10^23 = 0.421 * 10^23 or about 4.2 x 10^22 molecules of O
moles SiO2 = 2.10 g(1 mole SiO2)/(60.0843 g) = 0.0350 mol SiO2 moles of O atoms = 0.0350 mol SiO2[(2 mol O atoms)/(1 mol SiO2)] = 0.0700 mol O atoms no. O atoms = (0.0700 mol O atoms)[6.022 x 10^23 atoms)/(1 mole O atoms) = 4.21 x 10^22 O atoms in 2.10 g of SiO2, where SiO2 is the same as quartz.
