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Reaction equations and mass

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1) Write the balanced molecular equation for the reaction of calcium with molecular oxygen to form calcium oxide.

2) You start out with an empty crucible weighing 19.3350g. After adding some calcium to the crucible, the mass is now 22.1156g. After heating the calcium and completely converting it to the oxide, the mass of the crucible is now 25.7701g. Find the mass of the calcium and oxygen in the oxide.

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This solution is provided in 307 words in an attached .doc file. How to balance a molecular equation is given as well as how to calculate mass in a reaction.

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Please give step by step solutions and answers.

1) Write the balanced molecular equation for the reaction of calcium with molecular oxygen to form calcium oxide.

The molecular equation for the reaction between Ca and O2 is as follows:

The product is Calcium oxide. Now this equation needs to be balanced. Thus, if we place a 2 in front of the CaO, that would balance out the oxygen ...

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