An important reaction that takes place in the atmosphere is NO2(g) −→ NO(g) + O(g), which is brought about by sunlight.

Calculate the standard enthalpy of the reaction from the following information

O2(g) −→ 2 O(g) ∆H◦ = 498.4 kJ

NO(g) + O3(g) −→ NO2(g) + O2(g) ∆H◦ = −200 kJ

The standard enthalpy of formation for ozone is 142.7 kJ.

1.) 306.5 kJ

2.) 449.2 kJ

3.) 963.8 kJ

4.) 320.2 kJ

5.) 555.7 kJ

6.) 820.5 kJ

7.) 106.5 kJ

Fugu, also known as puffer fish, is a sushi delicacy that can also be lethal. puffer fish contain a powerful toxin that can kill an adult a few hours after ingestion. sushi chefs who prepare fugu must be specially trained because any contamination of the toxin-free areas of the fish can be deadly. recently this toxin has been put to good use, as scientists have discovered that a purified form of it can treat severe pain in cancer patients. this recent scientific discovery would fall under which area of chemistry? applied biochemistry pure organic chemistry pure physical chemistry applied inorganic chemistry

List four observations that indicate that a chemical reaction may be taking place

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.