Manganese(II) oxide can react with oxygen to form manganese(IV) oxide as shown below/
2:
2 MnO(s) + O2(g) → 2 MnO2(s)

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When 52.4g of the manganese(II) oxide reacted, 175.9kJ of heat energy was
released. What is the molar enthalpy of reaction for the manganese(II) oxide?
Answer in kJ/mol to one decimal place. You may attach a picture of your work to
support your answer.

Which of the following statements is true about planck’s law

Match each object to its description: a. coma of a comet b. comet tail c. oort cloud haze surrounding a nucleus created by solar wind. hypothetical sphere around the solar system

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.