STEM Chem U2 L3 Balancing Chemical Equations Problem Set

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO 

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How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl₂ + H₂

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Drag and drop the coefficients that would balance this equation:

​ (a)   Al + ​ (b)   HCl --> ​ (c)   H₂ + ​ (d)   AlCl₃

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Drag and drop the coefficients that would balance this equation:

​ (a)   H₂ + ​ (b)   O₂ --> ​ (c)   H₂O

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Drag and drop the coefficients that would balance this equation:

​ (a)   Mg + ​ (b)   O₂ --> ​ (c)   MgO

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Drag and drop the coefficients that would balance this equation:

​ (a)   SeCl₆ + ​ (b)   O₂→ ​ (c)   SeO₂ + ​ (d)   Cl₂

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Drag and drop the coefficients that would balance this equation:

​ (a)   Zn+​ (b)   HCl -->​ (c)   ZnCl₂ + ​ (d)   H₂

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Drag and drop the coefficients that would balance this equation:

​ (a)   P₄ + ​ (b)   O₂  -->  ​ (c)   P₂O₃

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Drag and drop the coefficients that would balance this equation:

​ (a)   HgO --> ​ (b)   Hg + ​ (c)   O2

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Drag and drop the coefficients that would balance this equation:

​ ​ (a)   Fe + ​ ​ (b)   O₂ -> ​ ​ (c)   Fe₂O₃

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