How many oxygen atoms are in 3.60 g of quartz?

7.226 x 10^22 oxygen atoms

EXPLANATION :

we know that 1 mole of anything is 6.022 x 10^23 of that thing.

The formula of Quartz is SiO2. So, 1 mole of Quartz will have 2 moles of oxygen atoms, i.e. 2 x 6.022 x 10^23 atoms of oxygen.

The molar mass of quartz is 60 g per mol. So, 60 g quartz means 1 mole quartz. We are given 3.6 g quartz,

60 g quartz means 1 mole quartz or 2 x 6.022 x 10^23 oxygen atoms.

then 3.6 g quartz will have oxygen atoms equal to (2 x 6.022 x 10^23 x3.6) / 60 =  0.7226 x 10^23 oxygen atoms or 7.226 x 10^22 oxygen atoms.

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

the answer would be b i believe