Answer:
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The actual yield of iron = 0.294 moles
Explanation:
Step 1: The balanced reaction
Fe2O3 +3C → 2Fe + 3CO
For 1 mole of Fe2O3 consumed, there is needed 3moles of Carbon to produce 2 moles of Fe and 3 moles of CO
Step 2: Calculate moles of Fe
Moles of iron = mass of iron / Molar mass of iron
moles of iron = 16.4 g / 55.845g/mole = 0.294 mole
The actual yield of iron = 0.294 mole
Step 3: Fe2O3 is the limiting reactant, this means the 0.236 moles will completely react.
1 mole of Fe2O3 consumed, will produce 2 moles of Fe
This means 0.236 moles of Fe2O3 will produce 2*0.236 = 0.472 moles of Fe. This is the theoretical yield of iron.
The percentage yield = 0.294/0.472 * 100% = 62.29 %
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<u>The actual yield of iron = 0.294 moles</u>
This problem is asking for the theoretical effective nuclear charge for sodium and a reason behind its difference with the actual one. At the end, the answers are 1+ and because the 3s¹ electron has a small probability of being closer to the nucleus.
<h3>Effective nuclear charges</h3>
In chemistry, the effective nuclear charge is defined as the net positive charge valence electrons experience. In addition, one can approximate it with the equation:
Zeff = Z – S
Where Z is the atomic number or number of electrons and S the core electrons.
In such a way, since sodium has 11 electrons and 10 core electrons due to its electron configuration (1s²2s²2p⁶3s¹), one concludes its effective nuclear charge is:
Zeff = 11 - 10 = +1
On the other hand, since the actual effective nuclear charge has a value of about 2.667, one concludes this difference is due to the fact that the 3s¹ electron has a small tendency of being closer to the nucleus and therefore, there is a likelihood that this electron undergoes a greater attraction in comparison to the proposed in the theoretical model.
Learn more about effective nuclear charges: brainly.com/question/6965287
You should doing this step by step, instead of search online
5,600 J would be the answer
Explanation:
Joules = mass x specific heat x temperature change
32 x 4.184 x (54 - 12)
= 133.888 x 42
= 5,623.296
(significant figures => 5,600)