Final answer:
To find the number of moles of He in 4.1 grams, divide the mass of He by its molar mass, resulting in 1.025 moles of He.
Step-by-step explanation:
To calculate the number of moles of Helium (He) in 4.1 grams of He, we need to use the molar mass of helium. Helium has an atomic mass of approximately 4.00 grams per mole. Therefore, we can set up a simple division to find out the moles of helium:
Moles of He = mass of He (g) / molar mass of He (g/mol)
Moles of He = 4.1 g / 4.00 g/mol
By performing the division, we get:
Moles of He = 1.025 moles of helium.