What is the change in enthalpy for the combustion reaction of butane, C4H10?

2C4H10 (g) + 13O2 (g) → 10H2O (g) + 8CO2 (g)

Given:

C4H10 (g) : ΔHf ° = - 125 kJ

H2O (g) : ΔHf ° = - 242 kJ

CO2 (g) : ΔHf ° = - 393.5 kJ

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A 0.250 M solution of HCN has a pH = 4.87. a) Determine the [H3O+] in the solution. b) Calculate the percent ionization of HCN in this solution.

If an equal number of moles of the weak acid hf and the strong base naoh are added to water, is the resulting solution acidic, basic, or neutral?

Why electrons are transferred during the course of the reaction between magnesium and oxygen?

Human muscle stores sugars in the form of

How much heat is needed to raise the temperature of 75 g of a substance by 15 C when the specific heat is 0.92 J/g-C?

A nitric acid solution flows at a constant rate of 5L/min into a large tank that initially held 200L of a 0.5% nitric acid solution. The solution inside the tank is kept well stirred and flows out of the tank at a rate of 10L/min.

How many molecules are in 237g (about a cup of water)