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Correctly Balancing Equations

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Which, if any, of the following equations is or are correctly balanced?

NH4NO3 N2 + O2 + H2O
3Cu + 8HNO3 3Cu(NO3)2 + 2NO + 4H2O
6CO2 + 6H2O C6H12O6 + 6O2
NaOH + Cl2 NaOCl + NaCl + H2O

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The expert correctly balancing equations.

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Balancing Reactions

Please see the attached file for the fully formatted problems.

In the real world, you do not have a program to balance equations for you. For questions 12-16 below, please fill in the first table below to indicate the initial numbers of reactant and product atoms. Balance the equation on your own and then fill in the second table for an updated table of reactant and product atoms which shows that the equation has been balanced.
Example:
H2 + I2 ® HI

Make a table to show the initial numbers of reactant and product atoms:

Atoms on the left of the arrow Atoms on the right of the arrow
2 H 1 H
2 I 1 I

Balance the equation: H2 + I2 ® 2 HI

Make a table to show that the reaction is correctly balanced:

Atoms on the left of the arrow Atoms on the right of the arrow
2 H 2 H
2 I 2 I

12. _____ Na + _____ H2O --> _____ NaOH + _____ H2

Make a table to show the initial numbers of reactant and product atoms:

Atoms on the left of the arrow Atoms on the right of the arrow

Balance the equation:

Make a table to show that the reaction is correctly balanced:

Atoms on the left of the arrow Atoms on the right of the arrow

13. _____ H2SO4 + _____ NaOH --> _______ Na2SO4 + _____ H2O
Make a table to show the initial numbers of reactant and product atoms:

Atoms on the left of the arrow Atoms on the right of the arrow

Balance the equation:

Make a table to show that the reaction is correctly balanced:

Atoms on the left of the arrow Atoms on the right of the arrow

14. _____K + _____ B2O3  _______ K2O + _______ B
Make a table to show the initial numbers of reactant and product atoms:

Atoms on the left of the arrow Atoms on the right of the arrow

Balance the equation:

Make a table to show that the reaction is correctly balanced:

Atoms on the left of the arrow Atoms on the right of the arrow

15. _____ C + _____ S8  ______ CS2
Make a table to show the initial numbers of reactant and product atoms:

Atoms on the left of the arrow Atoms on the right of the arrow

Balance the equation:

Make a table to show that the reaction is correctly balanced:

Atoms on the left of the arrow Atoms on the right of the arrow

16. ______ NaOH + _______ H2CO3  ______ Na2CO3 + _______ H2O
Make a table to show the initial numbers of reactant and product atoms:

Atoms on the left of the arrow Atoms on the right of the arrow

Balance the equation:

Make a table to show that the reaction is correctly balanced:

Atoms on the left of the arrow Atoms on the right of the arrow

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