Hmmm.. i think B. I dont understand the the answer choices.
Answer:
Chemical formula for the black iron oxide sample is FeO
Explanation:
<u>Given:</u>
Mass ratio of black iron oxide sample, Fe/O = 3.491
<u>To determine:</u>
The chemical formula
<u>Calculation:</u>
The mass ratio is Fe:O = 3.491 : 1
Mass of Fe = 3.491 g
Mass of O = 1.000 g
Atomic mass of Fe =55.85 g/mol
Atomic mass of O = 16.00 g/mol
Therefore, the molar ratio of Fe:O = 1:1
Hence, chemical formula is FeO
Answer: 4010 mol of iron atoms
Explanation:
<u>Given Information</u>
Iron Oxide = Fe₂O₃
Mass = 320 kg
<u>Given atomic mass / molecular weight</u>
Fe = 55.8 g / mol
O = 16.0 g / mol
Fe₂O₃ = 55.8 × 2 + 16.0 × 3 = 159.6 g / mol
<u>Given formula</u>
n = m / M
- n = number of moles
- m = mass
- M = molecular weight
<u>Convert the unit of mass to Gram</u>
1 kg = 1000 g
320 kg = 320 × 1000 = 320 000 g
<u>Substitute values into the given formula</u>
n = m / M
n = (320000) / (159.6)
n ≈ 2005 mol of Fe₂O₃
<u>Calculate the number of moles of Fe (Iron atoms)</u>
Since each mole of Fe₂O₃ has 2 moles of Fe, then:
2005 × 2 =
Hope this helps!! :)
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Answer:
B
Explanation:
the electrical charges of nonpolar molecules are evenly distributed across the molecule