Answer:
[tex]CuSO_{4}+2HCN\rightarrow Cu(CN)_{2}+H_{2}SO_{4}[/tex]
Explanation:
The valancy of Cu = +2
SO4 = -2
CN = -1
H =+1
So when HCN and CuSO4 react Cu(CN)2 and H2SO4 are formed.
Cu(CN)2 formation :
2 CN = 2 x -1 = -2
Its should attach to +2 charge atom which is Cu
So 1 Cu and 2 CN = Cu(CN)2
Similary,
H2SO4 formation:
SO4 = -2 charge
It require +2 charge so need two H+
2 H = 2x1 = +2 charge
Hence , 1 SO4 and 2 H combine to form H2SO4
Law of conservation of mass: It states that mass can neither be created nor destroyed during a chemical reaction.
Total mass of the reactant must be equal to total mass of product.
Only those equations are balanced which follows law of conservation of mass
Count total number of atoms in the reactant and product .
The number of atoms in the product = The number of atoms in the reactant
In the given equation:
[tex]CuSO_{4}+2HCN\rightarrow Cu(CN)_{2}+H_{2}SO_{4}[/tex]
Reactant are 2HCN and CuSO4
atoms of H = 1x2=2 , C=1x2=2 , N=1x2=2 , Cu = 1, S = 1 ,O =4
Products: Cu(CN)2 and H2SO4
atoms of H =2 , S=1 , O=4 ,C = 2x1=2 , N = 2x1 =2 , Cu = 1
Hence this is balance equation
