What is quartz? what is it used for?
Let UNITs guide you; always USE THEM in your calculation to prevent errors quartz = SiO2 O atoms = 2 O/SiO2 1.40g SiO2/density SiO2 in g/mole * 6.022E23 atoms/mole = ? Plug and SOLVE Basic mathematics is a prerequisite to chemistry – I just try to help you with the methodology of solving the problem.
