What is the molar mass of a substance

Measuring which physical property is most likely to produce the most precise results when trying to identify a substance

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

Harvey mixes two liquids. which observation of the new mixture most likely indicates a precipitate is forming?