Answer:
So, the helium balloon contains 0.125 moles of helium.
Step-by-step explanation:
To find the number of moles of helium in a sample, you can use the molar mass of helium and the given mass of helium in the sample.
The molar mass of helium (He) is approximately 4.00 grams per mole (g/mol).
Given: Mass of helium = 0.50 grams (g)
Now, you can use the formula:
Number of moles (n) = Mass (m) / Molar mass (M)
Number of moles of helium = 0.50 g / 4.00 g/mol
Number of moles of helium = 0.125 moles
So, the helium balloon contains 0.125 moles of helium.