Will mark brainliest! explain why a mechanical wave does not exist in a vacuum.

answer; ///(b); /// i do believe that the correct answer is protons and neutrons..

the heat will be evolved in following process:

1) cooling steam from to = q1

2) conversion of steam to water =q2

3) cooling of water to to =q5

let us calculate each energy one by one:

1) q1:

mass of water vapour = moles x molar mass = 1mol x 18 = 18 grams

heat capacity of steam is

2) q2:

for this we need heat of vaporisation of water = -40.7kj/mol

so the heat evolved in conversion of stem to water is -40.7kj

3) q3

the specific heat of water is

heat evolved in cooling of water will be

4)q4:

the heat of conversion of ice to water (melting) is 6.02kj/mol

5) q5

the cooling of ice will require

the total energy released is

the heat released will be 59.474 kj