Makisha asked in Science & MathematicsChemistry · 1 decade ago

How do u balance these chem. equations?

1. LiOH

2. H2 + O2

3. Al(NO3)3 + Fe

4. Ca(NO3)2 + H2O

Update:

oh. my bad..

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

5 Answers

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  • 1 decade ago
    Favorite Answer

    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!!

  • 4 years ago

    This Site Might Help You.

    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 decade ago

    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

    4. Rewrite your equation

    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 decade ago

    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!

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  • Irene
    Lv 4
    4 years ago

    HC2H3O2 + NaOH ---> NaC2H3O2 + H2O acetic acid + sodium hydroxide ---> sodium acetate + water Your Welcome.

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