Question

If a lab requires you to use 1.25 mol oxygen gas in a chemical reaction, how many molecules of oxygen will you need?

Answer 1

7.53*10²³ molecules of oxygen will you need.

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) that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number applies to any substance.

You can then apply the following rule of three: if by definition of Avogadro's Number 1 mole of oxygen gas contains 6.023*10²³ molecules, 1.25 moles contains how many molecules?

`amount of molecules=(1.25 moles*6.023*10^(23)molecules )/(1 mole)`

amount of molecules= 7.53*10²³

7.53*10²³ molecules of oxygen will you need.