Question

How many molecules are present in 2.0 moles of nitrogen gas N2?A) 3.01 x 10 to power 23B) 6.02 x 10 power 23c) 5.6 x 10 power 24d 1.2 x 10 power 24

Answer 1

d) 1.2 x 10²⁴ (molecules).

Step-by-step explanation:

The Mole => Avogadro's Number.

Remember that the Avogadro's number is 6.022 x 10²³ molecules/mol. This means that we have 6.022 x 10²³ molecules in 1 mol. We want to find how many molecules there are in 2.0 moles of N2 gas, so the calculation will look like this:

`2.0\text{ moles N}_2\cdot\frac{6.022\cdot10^(23)\text{ molecules}}{1\text{ mol }}=1.2\cdot10^(24)\text{ molecules N}_2.`

To convert from moles to molecules you just have to multiply the number of moles by Avogadro's number, so in this case, the answer would be d) 1.2 x 10²⁴ (molecules).