In an investigation to determine the solubility of NaCl in water, methanol and hexane, a student adde 40.0 g of NaCl to 100.0 ml of each liquid maintained at a temperature of
25’ c. after 2 minutes of stirring each mixture, the mass of undissolved salt was determined through filtering the mixture and weighing the residue. the results of the investigation are shown below.

liquid Mass of NaCl (s)
Recovered by filtration
hexane 39.9
methanol 38.6
water 3.85
a .
place the liquids tested in order of their increasing solubility of NaCl

b.
explain the trend in solubility of NaCl in the three liquids using your knowledge of the process by which ionic solids dissolve and the intermolecular forces involved.

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.

answer;

18.5 seconds

explanation;

velocity is distance covered per unit time; it is given by displacement divided by time.

thus; time = displacement/velocity

total time = total displacement/velocity

total distance = 5000 meters south

total time = 5000/4.5

                  = 1111.11 seconds

but; 1 minute = 60 sec

thus; 1111.11 /60

                = 18.51 seconds

thus; the time taken is 18.5 seconds