Questions from General Chemistry

Q: Calculate the enthalpy change when 5.00 g of propane is

Calculate the enthalpy change when 5.00 g of propane is burned with excess oxygen according to the reaction C3H8(g) + 5O2(g) 3CO2(g) + 4H2O(l) ∆H = -2221 kJ/mol

Q: Which of the following processes is(are) exothermic?

Which of the following processes is(are) exothermic? a. combustion of methane (e.g., Bunsen burner) b. melting of ice c. evaporation of acetone (e.g., fingernail polish remover) d. steam condensin...

Q: The specific heat capacity of graphite is 0.71 J/

The specific heat capacity of graphite is 0.71 J/g °C. Calculate the energy required to raise the temperature of 2.4 moles of graphite by 25.0 °C.

Q: Using the average atomic masses given inside the front cover of this

Using the average atomic masses given inside the front cover of this book, calculate the mass in grams of each of the following samples. a. 2.17 moles of germanium, Ge b. 4.24 mmol of lead(II) chlor...

Q: Consider the reaction B2H6(g) + 3O2(g

Consider the reaction B2H6(g) + 3O2(g) B2O3(s) + 3H2O(g) ∆H = -2035 kJ Calculate the amount of heat released when 54.0 g of diborane is combusted.

Q: The random motions of the components of an object constitute the of

The random motions of the components of an object constitute the of that object.

Q: An atom has a small charged core called the nucleus, with

An atom has a small charged core called the nucleus, with charged electrons moving in the space around the nucleus.

Q: The energy of a photon of visible light emitted by an excited

The energy of a photon of visible light emitted by an excited atom is the energy change that takes place within the atom itself.

Q: Light waves move through space at a speed of meters per second

Light waves move through space at a speed of meters per second.

Q: How does the attractive force that the nucleus exerts on an electron

How does the attractive force that the nucleus exerts on an electron change with the principal energy level of the electron?