50. The Sun's energy and composition is provided by which of the following? A. the burning of fossil fuels within the Sun
B. solar power that produces electricity in the Sun
C. the Sun's magnetic field
D. the fusion of hydrogen into helium

Base your answer on the information below and on your knowledge of chemistry. nitrogen dioxide, no2, is a dark brown gas that is used to make nitric acid and to bleach flour. nitrogen dioxide has a boiling point of 294 k at 101.3 kpa. in a rigid cylinder with a movable piston, nitrogen dioxide can be in equilibrium with colorless dinitrogen tetroxide, n2o4. this equilibrium is represented by the equation below. 2no2(g) n2o4(g) + 58kj at standard pressure, compare the strength of intermolecular forces in no2(g) to the strength of intermolecular forces in n2(g).

Based on the equation and the information in the table, what is the enthalpy of the reaction?

How does the viscosity of magma change as magma cools?