Timed
harry has a sample of an unknown material. the sample has a mass of 81 grams and a volume of 0.9 cubic centimeters. what is the density of the sample in grams per cubic centimeter?
plz !

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.

In in , is to a 28.4-g (1-oz)−23.0 °c to −1.0 °c?

)in the deacon process for the manufacture of chlorine, hcl and o2 react to form cl2 and h2o. sufficient air (21 mole% o2, 79% n2) is fed to provide 35% excess oxygen, and the fractional conversion of hcl is 85%. calculate the mole fractions of the product stream components.