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What is the percentage by mass of silicon (si) in iron aluminum silicate (fe3al2(sio4)3)?

Strong conductivity of plasma allows it to act and react as and

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?