Calculate ΔH for 2NO (g) + O2 (g) → N2O4(g) using the following information N2O4 (g)→ 2NO2 (g) ΔH = 57.9 KJ ,
2NO (g)+O2(g) → 2NO2 (g) ΔH= -113.1 KJ
a) 2.7KJ b) -55.2KJ c) -85.5 KJ d)-171.0 KJ e) +55.2KJ
Is the answer d?

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat

Label a-f based on the table using c for concentrated and d for dilute