Convert the given amounts using the relationships from example two. Be sure to pay attention to the significant digits: 1. 25 g of elemental iron to moles of elemental iron, Fe. 0.45 molFe 2. 15.6 moles of carbon monoxide to grams of carbon monoxide, CO. $$ 437900 $$ 3. 125 g of sodium sulfide to moles of sodium sulfide, Na S . 1.60 mol Na s 4. 1.25 moles of copper(II) sulfide to grams of copper(II) sulfide, CuS. $$ 119.5 \mathrm{~g} \mathrm{CuS} $$ 5. $$ 3.34 \times 10^{24} $$ formula units iron(II) nitrate to moles of iron(II) nitrate $$ \mathrm{Fe}\left(\mathrm{NO}_{3}\right) $$ s- $$ 5.54 \mathrm{~mol} \mathrm{Fe}(\mathrm{NO}) $$ 6. $$ \quad \mathbf{1 . 3 4 5} $$ grams of iron (III) nitrate to moles of iron(III) nitrate $$ \mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{s} $$ $$ 5.56 \times 10 \mathrm{~mol} \mathrm{Fe}(\mathrm{NO}) $$ 7. 2.25 grams of glucose to molecules of glucose $$ \mathrm{C}_{8} \mathrm{H}_{12} \mathrm{O}_{8} $$ $$ 7.53 \times 10 \text { molecules } \mathrm{CHO} $$ 8. 375 grams of exygen to molas of oxygen, $$ \mathrm{O}_{2} $$ 11.7 mol 이 9. 25.3 a of aluminum sulfate to formula units of aluminum sulfate $$ \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3} $$

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To convert the given amounts using the relationships from example two, we need to follow the steps below:

1. Convert 25 g of elemental iron to moles of elemental iron, Fe.
2. Convert 15.6 moles of carbon monoxide to grams of carbon monoxide, CO.
3. Convert 125 g of sodium sulfide to moles of sodium sulfide, NaS.
4. Convert 1.25 moles of copper(II) sulfide to grams of copper(II) sulfide, CuS.
5. Convert $$3.34 \times 10^{24}$$ formula units of iron(II) nitrate to moles of iron(II) nitrate, Fe(NO$$_3$$)$$_s$$.
6. Convert 1.345 grams of iron(III) nitrate to moles of iron(III) nitrate, Fe(NO$$_3$$)$$_s$$.
7. Convert 2.25 grams of glucose to molecules of glucose, C$$_8$$H$$_{12}$$O$$_8$$.
8. Convert 375 grams of oxygen to moles of oxygen, O$$_2$$.
9. Convert 25.3 g of aluminum sulfate to formula units of aluminum sulfate, Al$$_2$$(SO$$_4$$)$$_3$$.

Let's start with the first conversion:

1. Convert 25 g of elemental iron to moles of elemental iron, Fe.

The molar mass of iron (Fe) is 55.85 g/mol. To convert grams to moles, we use the formula:

$$ \text{moles} = \frac{\text{mass in grams}}{\text{molar mass}} $$

Substitute the values:

$$ \text{moles of Fe} = \frac{25 \text{ g}}{55.85 \text{ g/mol}} $$

Calculate the moles of Fe.
Calculate the value by following steps:
- step0: Calculate:
  $$\frac{25}{55.85}$$
- step1: Convert the expressions:
  $$\frac{25}{\frac{1117}{20}}$$
- step2: Multiply by the reciprocal:
  $$25\times \frac{20}{1117}$$
- step3: Multiply:
  $$\frac{25\times 20}{1117}$$
- step4: Multiply:
  $$\frac{500}{1117}$$
The moles of Fe is approximately 0.447628 mol.

Now, let's move on to the next conversion.
1. 25 g of elemental iron is approximately 0.448 mol Fe. 2. 15.6 mol of carbon monoxide is 437.9 g CO. 3. 125 g of sodium sulfide is 1.60 mol Na₂S. 4. 1.25 mol of copper(II) sulfide is 119.5 g CuS. 5. $$3.34 \times 10^{24}$$ formula units of iron(II) nitrate is 5.54 mol Fe(NO₃)₃. 6. 1.345 g of iron(III) nitrate is $$5.56 \times 10^{-5}$$ mol Fe(NO₃)₃. 7. 2.25 g of glucose is $$7.53 \times 10^{22}$$ molecules of C₈H₁₂O₈. 8. 375 g of oxygen is 11.7 mol O₂. 9. 25.3 g of aluminum sulfate is $$1.34 \times 10^{23}$$ formula units of Al₂(SO₄)₃.

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