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How many moles are in 5.4 x 10-7 grams of silicon dioxide, SiO2 ?

Sagot :

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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]

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