How much energy would be absorbed or released by the h2o in the process 30 grams h2o(
g. at 100◦c → 30 grams h2o(ℓ) at 20◦c ?

Explanation:

In this case we have two processes. First, we have to convert the gas water into liquid water at 100 ºC and then we have to go from 100 ºC to 20 ºC  in the liquid state.

For the first part, we have to use the enthalpy of vaporization (), so:

In this case we go from gas to liquid, so energy is released, therefore:

In the second part we have to calculate the energy in the change from 100 ºC to 20 ºC, so:

ΔT

So, in total we will have:

or

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.

no, the red giant is the hottest with 2.00.000.000 degrees celsius. while the white dwarf only 25,000 degrees celsius.