If one mole of a substance has a mass of 28.0 g, how many moles are in 2.4 g of the substance? Express your answer in moles using the correct number of significant figures. Do not enter your answer using scientific notation

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

In this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced?