How many formula units make up 12.8 g of magnesium chloride (MgCl2)? Express the number of formula units numerically.
1 answer:
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Answer:
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
<u><em>Law of conservation of mass:</em></u><em> It states that mass can neither be created nor destroyed during a chemical reaction.</em>
<em>Total mass of the reactant must be equal to total mass of product.</em>
<u>Only those equations are balanced which follows law of conservation of mass </u>
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:
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