Which statement is true about molarity and percent by mass?

How many moles are in a sample of 4.55 x 10^24 molecules of C3H8?

Which feature of a rock layer must be younger than the rock layer itself? A) folding B) sediment grains C) minerals D) fossils

Liquid Sample A has a higher vapor pressure than liquid Sample B (both in closed containers). What can be said about Sample A compared with Sample B? a. The liquid in Sample A vaporizes more easily than in Sample B. b.

If a saturated solution of potassium chloride is cooled from 80℃ to 50℃, how much precipate is formed

Which of the following is the same as a beta particle? a. photon b. electron c. helium nucleus

Members of which group easily lose an electron to form a 1 cation? A. halogens B. alkaline earth metals C. noble gases D. alkali metals

If 420 joules of heat energy is added to 25 grams of water at 25 degrees celcius, what will be the final temperature of the water, in Celcius degrees?

What is the term for the smallest bit into which a chemical substance can be divided and still have the properties of that substance? A) electron B) atom C) molecules D) iron

What is the percent yield if 0.3 mol ba (no3) 2 and 0.25 mol na3po4 react to produce 0.095 mol ba3 (po4) 2?

A compound is a pure substance. It can not easily be broken down into parts by physical means. A) True B) False