How many total "elements" are in the chemical equation? H2 + O2 + H2 → H2O + H2O

1
6
12
2

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Define dew point. i am writing this part to be able to ask the question

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy