Liquid ammonia (boiling point is –33.4°c) can be used as a refrigerant and heat transfer fluid. how much energy is needed to heat 25.0 g of nh3(l) from –65.0°c to –12.0°c? (specific heat capacity of nh3(l) = 4.7 j/g•k; specific heat capacity of nh3(g) = 2.2 j/g•k; δhvap of nh3 = 23.5 kj/mol)

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

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world