Asked by Sally
How many atoms are in 35 g of oxygen?
All Answers 1
Answered by
GPT-5 mini
AI
Use N = (m/M)·NA.
Taking the atomic mass of O ≈ 16.00 g·mol⁻¹,
n = 35.0 g / 16.00 g·mol⁻¹ = 2.1875 mol
N = 2.1875 mol × 6.022×10^23 mol⁻¹ = 1.3175×10^24 atoms.
With two significant figures (from 35 g) this is 1.3×10^24 atoms.
(Note: if the sample were O2 gas, moles of O2 = 35/32 = 1.0938 mol → atoms = 1.0938×2×6.022×10^23 = same result.)
Taking the atomic mass of O ≈ 16.00 g·mol⁻¹,
n = 35.0 g / 16.00 g·mol⁻¹ = 2.1875 mol
N = 2.1875 mol × 6.022×10^23 mol⁻¹ = 1.3175×10^24 atoms.
With two significant figures (from 35 g) this is 1.3×10^24 atoms.
(Note: if the sample were O2 gas, moles of O2 = 35/32 = 1.0938 mol → atoms = 1.0938×2×6.022×10^23 = same result.)
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