Answer to Question #265207 in General Chemistry for Schoolnote

Question

Peroxide reacts with water to produce oxygen. What would be the change in water temperature if we add 7800 grams of sodium peroxide to 110.00 ml of water? Reaction enthalpy = -285.0 kJ. Can you help me understand this problem?

Answer 1

We were given enthalpy

So we have to get our heat quantity first

H=-285000kJ

And ∆H=-Q

Q=285000J

Q=mc∆T

∆T=Q/mc

∆T=285000/(110×4.19)

∆T=618.4°C