What information can you determine from the coefficients in this balanced chemical equation? Mg + 2HCl → MgCl2 + H2

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?

In which environment would primary succession occur? a forest with a few remaining trees after a recent wildfire an area of exposed rock after a glacier melts away beach that is exposed to the air at low tide an abandoned baseball field in a small town

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?