Question

Which equivalence factor should you use to convert from 4.28 x 1019 molecules of oxygen (O2) to moles of O2? (1 mol O2/4.28 x 1019 molecules O2) (4.28 x 1019 molecules O2/1 mol O2) (1 mol O2/6.02 x 1023 molecules O2) (6.02 x 1023 molecules O2/1 mol O2)

Answer 1

The answer is: [C]: " (1 mol O₂/6.02 × 10²³ molecules O₂) " .
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Answer 2

The equivalence factor is
`(1 mole)/(6.023*10^(23) molecules)`

Step-by-step explanation:

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023 * 10²³ particles per mole. The Avogadro number applies to any substance.

A rule of three can be applied as follows: is 6,023 * 10²³ molecules are contained in 1 mole, 4.28*10¹⁹ molecules in how many moles will be contained?

`moles=4.28*10^(19) molecules*(1 mole)/(6.023*10^(23) molecules)`

moles=7.106*10⁻⁵

So, the equivalence factor is
`(1 mole)/(6.023*10^(23) molecules)`