Astudent determined that the weight-percent recovery for his isolated caffeine proved to be 1.5%. the student was concerned, expecting a yield of at least 50% as in many of the previous experiments. was his concern legitimate? explain.

Both josef loschmidt and amedeo avogadro contributed to our understanding of basic molecular numbers, sizes, and reaction ratios. neither scientist discovered “avogadro’s number” in the form we use it today (6.02 x 10 23). still, there’s a controversy over the name. research the contributions from these two scientists and read about how avogadro’s number got its name. briefly state what you think this number should be called, providing key details of each scientist’s contributions to this concept and a solid rationale for your case in naming the number.

The identities of substances are the same before and after which type of change

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule