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Question
- ____ $\ce{c_{4}h_{8}}$ + ____ $\ce{o_{2}}$ $\
ightarrow$ ______ $\ce{co_{2}}$ + ______ $\ce{h_{2}o}$
- ____ $\ce{ga(oh)_{3}}$ + ____ $\ce{kf}$ $\
ightarrow$ ______ $\ce{koh}$ + ______ $\ce{gaf_{3}}$
- ____ $\ce{v}$ + ____ $\ce{znbr_{2}}$ $\
ightarrow$ ______ $\ce{vbr_{3}}$ + ______ $\ce{zn}$
- ____ $\ce{as_{2}o_{5}}$ + ____ $\ce{h_{2}o}$ $\
ightarrow$ ______ $\ce{h_{3}aso_{4}}$
- ____ $\ce{nh_{3}}$ + ____ $\ce{o_{2}}$ $\
ightarrow$ ______ $\ce{no}$ + ______ $\ce{h_{2}o}$
- ____ $\ce{c_{3}h_{8}}$ + ____ $\ce{o_{2}}$ $\
ightarrow$ ______ $\ce{co_{2}}$ + ______ $\ce{h_{2}o}$
- ______ $\ce{naclo_{3}}$ $\
ightarrow$ ______ $\ce{nacl}$ + ______ $\ce{o_{2}}$
- ____ $\ce{ca}$ + ____ $\ce{o_{2}}$ $\
ightarrow$ ______ $\ce{cao}$
Problem 8: Balancing \( \boldsymbol{\ce{C4H8 + O2 -> CO2 + H2O}} \)
Step 1: Balance Carbon (C)
There are 4 C in \( \ce{C4H8} \), so we need 4 \( \ce{CO2} \).
\( \ce{C4H8 + O2 -> 4CO2 + H2O} \)
Step 2: Balance Hydrogen (H)
There are 8 H in \( \ce{C4H8} \), so we need 4 \( \ce{H2O} \) (since each \( \ce{H2O} \) has 2 H).
\( \ce{C4H8 + O2 -> 4CO2 + 4H2O} \)
Step 3: Balance Oxygen (O)
On the right, we have \( 4 \times 2 + 4 \times 1 = 12 \) O. So we need \( \frac{12}{2} = 6 \) \( \ce{O2} \).
\( \ce{C4H8 + 6O2 -> 4CO2 + 4H2O} \)
Step 1: Balance Fluorine (F)
There are 3 F in \( \ce{GaF3} \), so we need 3 \( \ce{KF} \).
\( \ce{Ga(OH)3 + 3KF -> KOH + GaF3} \)
Step 2: Balance Potassium (K)
There are 3 K in \( 3\ce{KF} \), so we need 3 \( \ce{KOH} \).
\( \ce{Ga(OH)3 + 3KF -> 3KOH + GaF3} \)
Step 3: Check other elements (Ga, O, H)
Ga: 1 on both sides. O: \( 3 \times 1 = 3 \) on left, \( 3 \times 1 = 3 \) on right. H: \( 3 \times 1 = 3 \) on left, \( 3 \times 1 = 3 \) on right. Balanced.
Step 1: Balance Bromine (Br)
There are 3 Br in \( \ce{VBr3} \) and 2 Br in \( \ce{ZnBr2} \). The least common multiple of 2 and 3 is 6. So we need 2 \( \ce{VBr3} \) (6 Br) and 3 \( \ce{ZnBr2} \) (6 Br).
\( \ce{V + 3ZnBr2 -> 2VBr3 + Zn} \)
Step 2: Balance Vanadium (V)
Now we have 2 V on the right, so we need 2 V on the left.
\( \ce{2V + 3ZnBr2 -> 2VBr3 + Zn} \)
Step 3: Balance Zinc (Zn)
There are 3 Zn in \( 3\ce{ZnBr2} \), so we need 3 Zn on the right.
\( \ce{2V + 3ZnBr2 -> 2VBr3 + 3Zn} \)
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\( 1 \ce{C4H8} + 6 \ce{O2} -> 4 \ce{CO2} + 4 \ce{H2O} \) (Coefficients: 1, 6, 4, 4)