For the diprotic weak acid h2a, ������a1=3. 2×10−6 and ������a2=6. 1×10−9. What is the ph of a 0. 0650 m solution of h2a ?.

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?

Explain how the integumentary system plays a crucial role in the ability to maintain homeoestasis

Gravitational potential energy is related to