What is the average mass (in grams) of a lithium atom?

Asample of the male sex hormone testosterone, c19h28o2, contains 3.88×10^21 atoms of hydrogen.(a) how many atoms of carbon does it contain? (b) how many molecules of testosterone does it contain? (c) how many moles of testosterone does it contain? (d) what is the mass of this sample in grams?

What is the most stable monatomic ion formed from nitrogen

An observation that requires measurement is called quantitative observable or qualitative