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3. __CH4 + __O2-> __CO2 + __H2O
4. __K + __H2O-> __KOH + __H2

User Retslig
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Answer:

3: 1 CH4+ 2 O2-> 1 CO2 + 2 H2O

4: 2 K+ 2 H2O -> 2 KOH+ 1 H2

Step-by-step explanation:

User Specialscope
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