To determine the number of moles in 5.00 grams of lithium, we first need to know the molar mass of lithium. The molar mass of lithium (Li) is approximately 6.94 grams per mole.
Now, we can use the following formula to find the number of moles:
Number of moles = mass (grams) / molar mass (grams/mole)
Substituting the values we have:
Number of moles = 5.00 grams / 6.94 grams/mole
Calculating this gives:
Number of moles ≈ 0.721 moles
This means that in 5.00 grams of lithium, there are approximately 0.721 moles of lithium.