You must add 7.5 pt of the 30 % sugar to the 5 % sugar to get a 20 % solution.
You can use a modified dilution formula to calculate the volume of 30 % sugar.
<em>V</em>_1×<em>C</em>_1 + <em>V</em>_2×<em>C</em>_2 = <em>V</em>_3×<em>C</em>_3
Let the volume of 30 % sugar = <em>x</em> pt. Then the volume of the final 20 % sugar = (5 + <em>x</em> ) pt
(<em>x</em> pt×30 % sugar) + (5 pt×5 % sugar) = (<em>x</em> + 5) pt × 20 % sugar
30<em>x</em> + 25 = 20x + 100
10<em>x</em> = 75
<em>x</em> = 75/10 = 7.5
The electrons move<span> around the protons, which are at the center of the atom. </span>How does the energy of an electron change when the electron moves closer to the nucleus<span>? ... When an </span>electron moves<span> from a lower to a higher </span>energy<span> level, the</span>electron<span>...</span>
Answer : The formula unit of compound will be, 
Explanation :
As we know that one atom of oxygen contains (2-) charge and one atom of lead contains (4+) charge. So, to balance the of charges of lead, the 2 oxygen atoms combine with the 1 lead atom. Thus, the compound formed will be, .
That means, when 
combine with oxygen that is, 
, it gives by the criss-cross method.
Criss cross method : It is a method of determining the chemical formula.
The formula unit is a shown below.
2HNO3 + Ba(OH)2 --> Ba(NO3)2 + 2H2O
Ba(NO3) or barium nitrate is the salt formed
