What is the answer to the following calculation rounded to the correct number of significant figures? 4.38 x 7.1296

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 approach is required to balance the objectives of sustainable development? balancing the objectives of sustainable development requires a(n) .

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer