3. Translate these written descriptions into chemical equations:
a. One molecule of methane (CH4) reacts with two molecules of oxygen (O2) to form one molecule of carbon dioxide (CO2) and two molecules of water (H2O).
b. One atom of sulfur (S) reacts with one molecule of oxygen (O2) to form one molecule of sulfur dioxide (SO2).
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CH4+2O2——->CO2+2H2O
S+O2——>SO2
S+O2——>SO2
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