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in phenomenin 3

phase change vapourization

1st liquid

2nd gas

When u give heat to the liquid their Kinetic energy increases when their kinetic energy increases they collide with eaxhother and move farther away resulting in escape of particles in from of gases

In phenomenon 4

phase change freezing

1st liquid

2nd solid

when temperature decrease the kinetic energy of particles decreases in result particles come close to each other and they convert into solid that is freezes

HOPE IT HELPS

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles

fe 55.85 g/mol and h2o 18.02 g/mol.