Asample of sea water taken from the atlantic ocean freezes at -2.14 degree celsius and a sample taken from the arctic ocean freezes at -1.96 degree celsius. what is the molality of salt in each seawater sample? (assume the only solute in each sample is sodium chloride)

(a) 0.575 m;

(b) 0.527 m

Explanation:

Let's use the freezing point depression law in each of these cases.

(a) According to the law:

Rearrange the equation for molality, b:

NaCl is an ionic substance, 1 mole of it dissociates into 2 moles of ions, sodium ion and chloride ion, this means the van 't Hoff factor i = 2.

Here:

is the initial freezing point of water,

is the final freezing point of water.

For water:

Applying the equation

(b) Applying the same equation for the same salt and the same conditions, except a new freezing point, we would expect to obtain:

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

i think its 100

i hope this !