The freezing point (tf) for t-butanol is 25.50°c and kf is 9.1°c/m. usually t-butanol absorbs water on exposure to the air. if the freezing point of a 11.9-g sample of t-butanol is measured as 24.59°c, how many grams of water are present in the sample?

The mathematical expression is given as:

            (1)

where, = depression in freezing point

= molal freezing point.

Now, first calculate the

Substitute the values in equation (1), we get

= or  

Now,

In 0.1 moles of water = 1 kg of butanol

So, 11.9 g of butanol =

Convert gram into kilogram, (1 kg =1000 g)

=

=

Mass of water present in sample =

=

Hence, grams of water present in the sample  =

b.final

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates