Question

The heat capacity of an object indicates how much energy that object can absorb for a given increase in that object's temperature. In a system in which two objects of different temperatures come into contact with one another, the warmer object will cool and the cooler object will warm up until the system is at a single equilibrium temperature.

Note the difference between the terms molar heat capacity, which has units of J/(mol⋅∘C), and specific heat, which has units of J/(g⋅∘C)

specific heat of water = 4.18 J/(g⋅∘C)

specific heat of steel = 0.452 J/(g⋅∘C)

The specific heat of water is 4.18 J/(g⋅∘C). Calculate the molar heat capacity of water.

Express your answer to three significant figures and include the appropriate units.

2) Diethyl ether, C4H10O(l), a flammable compound that has long been used as a surgical anesthetic, has the structure

CH3−CH2−O−CH2−CH3

The complete combustion of 1 mol of C4H10O(l) to CO2(g) and H2O(l) yields ΔH∘=−2723.7kJ

Write a balanced equation for the combustion of 1 mol of C4H10O(l).

Express your answer as a chemical equation. Identify all of the phases in your answer.

3)

Calculate the energy of a photon of radiation whose wavelength is 430 nm .

Express your answer with the appropriate units.

What wavelength of radiation has photons of energy 6.28×10⁻¹⁹ J ?

Answer 1