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lyudmila [28]
4 years ago
5

258.3 kg + 271.23 kg + 253 kg

Chemistry
1 answer:
gulaghasi [49]4 years ago
3 0

Answer:

The correct answer is 783 kg.

Explanation:

To solve this problem, we first must simply add all three values together. We can perform this operation because all three values have the same units of kilograms.

When we add, we get:

258.3 + 271.23 + 253 = 782.53 kg

However, this answer does not have the correct number of significant digits. When adding and subtracting values, we round our final answer to the least amount of decimal places of the numbers we were adding. In this case, that is 0 decimal places, because 253 doesn’t have a decimal place.

Therefore, we should round 782.53 to the ones place. Since the next number is a 5, we round up.

This gives us 783 kg, which is our final answer.

Hope this helps!

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In the oxidation of iron; how many grams of iron (III) oxide will be produced from 6.20 mol of Fe?
Flura [38]

Answer:

496 g of Fe₂O₃.

Explanation:

The balanced equation for the reaction is given below:

4Fe + 3O₂ —> 2Fe₂O₃

From the balanced equation above,

4 moles of Fe reacted to produce 2 moles of Fe₂O₃.

Therefore, 6.20 moles of Fe will react to produce = (6.20 × 2)/4 = 3.1 moles of Fe₂O₃

Finally, we shall determine the mass of 3.1 moles of Fe₂O₃. This can be obtained as follow:

Mole of Fe₂O₃ = 3.1 moles

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Mass of Fe₂O₃ = 496 g

Therefore, 496 g of Fe₂O₃ were produced from the reaction.

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