Refer to the example about diatomic gases A and B in the text to do problems 20-28.

It was determined that 1 mole of B2 is needed to react with 3 moles of A2.

How many grams in one mole of B2? g

Which two countries on the received the most total aid in 1948, the first year of the marshall plan?

Which choice analyzes the parts of the word and determines the meaning of the word spectator

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a study of twenty 4th grade classrooms in which researchers ask the schools to systematically vary the time of day reading is taught, and collect weekly assessments of reading comprehension for each child over a three-month period.the collection of data, by a playground designer hired by the superintendent of schools, about the physical dimensions of school playgrounds, presence of fencing, and the kinds of equipment currently provided.a feasibility study for implementing a year-round school program, focusing on economic issues such a facilities utilization and transportation costs.an analysis of aggregate data comparing statewide high school graduation rates provided by the state department of public instruction, using county tax information.