Answer:
- Amount of energy = -1066.92 J
- Yes, a phase change occurs from gaseous state to liquid state
- It is exothermic
Step-by-step explanation:
Using Q = m × c × ∆T
Where Q = amount of energy
m = mass = 17g
c = specific heat capacity of water (4.184J/g°C)
∆T = change in temperature (87°C - 102°C = -15°C)
Hence, Q = m × c × ∆T
Q = 17 × 4.184 × (-15°C)
Q = -1066.92 J
- According to this question, vapor condenses i.e. gaseous form of water changes to liquid water, which involves a reduction in temperature. Hence, a change of phase occurs from gaseous state to liquid state.
- Since the change of phase occurs from a less orderly state (gas) to a more orderly state (liquid), there is a release of energy i.e. EXOTHERMIC. The amount of energy or Enthalpy change (∆H) is negative