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tcastillo12 tcastillo12
  • 16-07-2016
  • Chemistry
Answered

How many moles are equal to 1.2 x 10^21 molecules of lithium?

A7.2 x 10^44 moles

B.2.0 moles

C7.2 x 10^24 moles

D2.0 x 10^-3 moles

Verified Answer :

Willchemistry
Willchemistry Willchemistry
  • 16-07-2016

1 mole --------------------------- 6.02 x 10²³ molecules
( moles lithium ) --------------- 1.2 x 10²¹ molecules

( moles lithium ) = (1.2 x 10²¹ ) x 1  / ( 6.02 x 10²³ )

= 1.2 x 10²¹ / 6.02 x 10²³

= 2.0 x 10⁻³ moles of lithium

Answer D

hope this helps!

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