How many iron atoms are contained in 354 g of iron? A) 2.62 × 10²⁵ Fe atoms B) 2.13 × 10²⁶ Fe atoms C) 4.69 × 10²⁴ Fe atoms D) 3.82 × 10²⁴ Fe atoms E) 9.50 × 10²² Fe atoms

Question

Quizplus · Accepted Answer

The first step is to convert the mass of iron to moles of iron using the molar mass of iron (55.85 g/mol):
354 g Fe × (1 mol Fe/55.85 g Fe) = 6.34 mol Fe
Next, we use Avogadro's number (6.022 × 10^23 atoms/mol) to convert from moles of Fe to atoms of Fe:
6.34 mol Fe × (6.022 × 10^23 atoms/mol) = 3.82 × 10^24 Fe atoms. 
Therefore, the answer is D) 3.82 × 10^24 Fe atoms.

How Many Iron Atoms Are Contained in 354 G of Iron