# How do u balance these chem. equations?

1. LiOH

2. H2 + O2

3. Al(NO3)3 + Fe

4. Ca(NO3)2 + H2O

Update:

let me rephrase those equations...

1. Li2O + H2O -----> LiOH

2. H2O --electric current--> H2 + O2

3. Al + Fe (No3)2 ----> Al(NO3)3 + Fe

4. HNO3 + Ca(OH)2 ---> Ca(NO3)2 + H2O

Relevance

1. here, u realise that Li is not balanced (i.e. left-hand side (LHS) has 2 Li atoms while right-hand side (RHS) has 1 Li atom). thus, u put a 2 in front of LiOH as shown : Li2O + H2O -> 2LiOH.

U hv balanced the Li atom. Now, check whether the H and O atom has been balanced. Since there is 2 Os and 2 H on either side of the equation, the equation is now balanced!

2. Ignore the electric current, cuz u're only concerned with the balanced equation and not how water was actually broken down. So, the process is not important. Here, the unbalanced atom is O as LHS as 1 and RHS 2. So, u put 2 in front of H20. With O balanced, check whether H is balanced. U'll realise it's not. So, put 2 in frt of H2. Now, both O and H atoms are balanced. Do not try to balance H using H20, because it'll cause O to be unbalance again and u'll nvr be able to balance the equation! Ans : 2H2O -> 2H2 + O2

3. here u realise N is not balanced. there's 2 N atoms on the left and 3 on the right. So, put 3 in frt of Fe(NO3)2 and 2 in frt of Al(NO3)3. next, u balance Al and Fe.

Ans: 2Al + 3Fe(NO3)2 -> 2Al(NO3)3 + 3Fe

4. here, N is also unbalanced. So u balance N by putting a 2 in front of HNO3. When u do this, though N is balanced, H isn't. So, u hv to put 2 in frt of H20. Now, both N and H are balanced. Now, check whether O is balanced. both sides has 8 Os, so O is balanced too. Note: try not to involve Ca(OH)2 and Ca(NO3)2 when u're balancing the equation cuz changing them will mean changing other atoms which u do not wish to change. Also, Ca is already balanced, so try not to touch them.

Ans: 2HNO3 + Ca(OH)2 -> Ca(NO3)2 + 2H2O.

Remember! after u hv balance the atoms, u hv to check that all atoms in the equations are balanced!!

RE:

How do u balance these chem. equations?

1. LiOH

2. H2 + O2

3. Al(NO3)3 + Fe

4. Ca(NO3)2 + H2O

Source(s): balance chem equations: https://shortly.im/wXPLn
• 1. Conider all compounds and break them don into their respective elements.

e.g. HCl + Na2CO3 -> NaCl +H2O + CO2

elements: H , Cl , Na , C, O

2. Write the number of atoms of each element and do this for all.

Elements : H , Cl , Na , C , O

Number of

atoms:

1. When

reacting : 1 , 1 , 2 , 1 , 3

2. After

reaction : 2 , 1 , 1 , 1 , 3

3. Mutiply the number of atoms by a number which will make it equal to that after or before the reaction.

UP TO YOU TO ARRANGE

2HCl + Na2CO3 -> 2NaOH + H2O +CO2

note that you can only add the mole ratio (i.e the 2 before HCl or any number before an atom or compound) only in front of an element if it is one, or before a compound if it is one ( 2 before NaOH in products )

• 1) Li2O + H2O ------>2 LiOH

2) H2O ------------> H2 + 1/2 O2

3) 2 Al +3 Fe(NO3)2 -------->3 Fe +2 Al(NO3)3

4) Ca(OH)2 + 2 HNO3 ---------> Ca(NO3)2 +2 H2O

Good luck!