Answer:
CH4 + 2O2 ==> CO2 + 2H2O
CaCl2 + 2AgNO3 ==> Ca(NO3)2 + 2AgCl
C2H6O + 3O2 ==> 2CO2 + 3H2O
Step-by-step explanation:
Important concept.
Coefficients : the big number which represents the number of molecules in an equation. we multiply the coefficient by the subscript of an element to find the number of atoms of that specific element. ex 2H3O2 To find the number of hydrogen atoms we multiply the coefficient 2 by the subscript after H 3. 3 x 2 = 6. there are 6 hydrogen atoms in 2H302
1.) CH4 + O2 ==> CO2 + H2O
First we must balance the number of hydrogen atoms on both sides. There are two hydrogen atoms on the right side but 4 hydrogen atoms on the left side. We can balance the number of hydrogen atoms by adding a coefficient of 2 to H2O.
We now have CH4 + O2 ==> CO2 + 2H2O
Next we must balance the number of Oxygen atoms. There are 2 oxygen on the left side and 4 on the right side. we can easily balance it by adding a coefficient of 2 to O2 to the right side
CH4 + 2O2 ==> CO2 + 2H2O
The equation is now balanced.
2.) CaCl2 + AgNO3 ==> Ca(NO3)2 + AgCl
==> balance # of Nitrogen and Oxygen atoms by adding a coefficient of 2 to AgNO3
CaCl2 + 2AgNO3 ==> Ca(NO3)2 + AgCl
==> balance # of silver and Chlorine atoms by adding a coefficient of 2 to AgCl
CaCl2 + 2AgNO3 ==> Ca(NO3)2 + 2AgCl
The equation is now balanced.
3.) C2H6O + O2 ==> CO2 + H2O
==> balance the # of hydrogen atoms by adding a coefficient of 3 to H2O
C2H6O + O2 ==> CO2 + 3H2O
==> balance the number of carbon atoms by adding a coefficient of 2 to CO2
C2H6O + O2 ==> 2CO2 + 3H2O
balance the number of Oxygen atoms by adding a coefficient of 3 to O2
C2H6O + 3O2 ==> 2CO2 + 3H2O
The equation is now balanced.