Answer:
there are [tex]\sf 9*10^{-9}[/tex] moles in grams [tex]\sf 5.4 * 10^{-9}[/tex] of silicon dioxide.
Explanation:
[tex]\boxed { \boxed{ \sf moles = \sf{\frac{mass}{Mr}} }}[/tex]
we should know that:
- [tex]\sf molar \ mass \ of \ SiO2 = 60[/tex]
- [tex]\sf given \ mass \ of \ SiO2 = 5.4 * 10^{-7}[/tex]
using the formula:
[tex]\sf moles = \frac{mass}{Mr}[/tex]
[tex]\sf moles = \frac{5.4*10^{-7}}{60}[/tex]
[tex]\sf moles = 9*10^{-9}[/tex]
