14. if 30% of a dna sample is made up of thymine, t, what percentage of the sample is made up of
cytosine, c?

20%

Explanation:

Okay so the phrase apples in trees ( Adenine & Thymine ) and cars in garages  (Cytosine & Guanine ) can help in this situation.

Since Thymine is 30%, Adenine will also be 30%. This gives you 60% of the DNA sample.

You have 40% left of the DNA sample so they must be Cytosine and Guanine.

Divide 40% by 2 and you get 20%. So you have 20% Guanine and 20% Cytosine.

Hope it helps!

: )

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l