Question

For the reaction:

H₂O(1)→ H₂O(g)
ΔΗ = 44 kJ
How much heat is required when 9.0 g of H₂O is used?

Answer 1

As per the reaction given

Moles of H_2O=1

• ∆H=44kJ

Moles of water in 9g

• Given mass/Molar mass
• 9g/18g/mol
• 0.5mol

∆H

• 44(0.5)
• 22KJ

Answer 2

1mol H_2O requires 44kJ heat

Moles of water

• Given mass/Molar mass
• 9/18
• 1/2
• 0.5mol

Heat required

• 0.5(44)
• 22kJ