PLEASE ANSWER This chemical equation represents a chemical equation.

2HNO3 + Na2SO3 → 2NaNO3 + H2O + SO2

Which chemical is a reactant in the reaction?

a. H2O
b. Na2SO3
c. SO2
d. NaNO3​

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An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

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