Answer:
mol(SiO₂) mol(C) mol(SiC) mol(CO)
Row 1: 0.8 x 10 0.9 x 10 0.3 x 10 0.6 x 10
Row 2: 0.2 x 10 0.6 x 10 0.2 x 10 0.4 x 10
Row 3: 8.0 2.4 x 10 8.0 1.6 x 10
Row 4: 2.8 8.4 2.8 5.6
Row 5: 0.816 2.45 0.816 1.63
Explanation:
- From the balanced equation:
<em>SiO₂(s) + 3C(s) → SiC(s) + 2CO(g),</em>
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It is clear that 1.0 mole of SiO₂ reacts with 3.0 moles of C to produce 1.0 mole of SiC and 2.0 moles of CO.
- We can complete the table of no. of moles of each component:
<em>A. complete the first row. Express your answers using one significant figure separated by commas. Mol C, Mol SiC, Mol CO =</em>
<em>3.0 moles of SiO₂:</em>
We use the triple amount of SiO₂, so we multiply the others by 3.0.
So, it will be 3.0 moles of SiO₂ with 9.0 moles of C that produce 3.0 moles of SiC and 6.0 moles of CO.
<em>B. Complete the second row. Express your answers using one significant figure separated by commas. Mol SiO2, Mol SiC, Mol CO =</em>
<em>6.0 mole of C:</em>
We use the double amount of C, so we multiply the others by 2.0.
So, it will be 2.0 moles of SiO₂ with 6.0 moles of C that produce 2.0 moles of SiC and 4.0 moles of CO.
<em>C. Complete the third row. Express your answers using two significant figures separated by commas. Mol SiO2, Mol C, Mol SiC =</em>
<em>16.0 moles of CO:</em>
We use the amount of CO higher by 8 times than that in the balanced equation, so we multiply the others by 8.0.
So, it will be 8.0 moles of SiO₂ with 24.0 moles of C that produce 8.0 moles of SiC and 16.0 moles of CO.
<em>D. Complete the fourth row. Express your answers using two significant figures separated by commas. Mol SiO2, Mol C, Mol SiC =</em>
<em>2.8 moles of SiO₂:</em>
We use the amount of SiO₂ higher by 2.8 times than that in the balanced equation, so we multiply the others by 2.8.
So, it will be 2.8 moles of SiO₂ with 8.4 moles of C that produce 2.8 moles of SiC and 5.6 moles of CO.
<em>E. Complite the fifth row. Express your answers using three significant figures separated by commas. Mol SiO2, Mol SiC, Mol CO =</em>
<em>2.45 moles of C:</em>
We use the amount of C lower by 0.8167 times than that in the balanced equation, so we multiply the others by 0.8167.
So, it will be 0.8167 moles of SiO₂ with 2.45 moles of C that produce 0.8167 moles of SiC and 1.633 moles of CO.
- <em><u>The answers are expressed in the required significant figures in the answer part (table above).</u></em>
