For Part a. We're being asked to determine the mass of one helium atom. The flow of our calculation will be like this:
Atoms He (Avogadro’s number) → Moles of He (molar mass of He) → Mass of He
• molar mass of He (from the periodic table) = 4.003 g/mol
• Avogadro’s Number: Avogadro’s number gives us the number of entities present in 1 mole: 6.022 × 1023 He atoms in 1 mole of He
a. What is the mass of one helium atom?
b. What is the mass of 1.5 moles of helium atoms?
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