Pure nitrobenzene freezes at 5.67 c. when 1.0g of ethanol (c2h6o) is mixed with 20.0g nitrobenzene, the freeze point drops to –0.53 c. what is the freezing-point depression constant (kf) of nitrobenzene?

The freezing-point depression constant (Kf) of nitrobenzene is

Explanation:

Depression in freezing point is given by:

= Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte nitrobenzene)

= freezing point constant = ?

m= molality

Weight of solvent = 20 g = 0.02 kg

mass of solute (ethanol) = 1.0 g

Molar mass of ethanol = 46 g/mol

Thus freezing-point depression constant (Kf) of nitrobenzene is

answer: option (4) is the correct answer.

explanation:

areas which are at low altitudes and near the equator tend to receive direct sunlight from the sun. hence, heat energy or radiations from the sun make these areas warmer and they have warmest water.

whereas areas which are at high altitudes and away from the equator do no receive direct sunlight. hence, no direct contact from the sun makes these regions colder and thus, they have colder water.

thus, we can conclude that the statement areas at low latitudes near the equator have the warmest water because they receive the most direct sunlight best explains the relationship between an area's geography and the temperature of its surface water.