You need a 40% alcohol solution. On hand, you have a 100 mL of a 25% alcohol mixture. You also have 65% alcohol mixture. How much of the 65% mixture will you need to add to obtain the desired solution

60 ml of the 65% mixture will you need to add to obtain the desired solution.

Explanation:

According to the dilution law,

where,

= concentration of given alcohol solution = 25 %

= volume of given alcohol solution = 100 ml

= concentration of another alcohol solution=65 %

= volume of another acid solution= x ml

 = concentration of resulting alcohol solution = 40 %

= volume of resulting acid solution = (100+x)

Thus 60 ml of the 65% mixture will you need to add to obtain the desired solution.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.