True or false? for the reaction represented by the balanced chemical equation
mg(oh)2(aq) + 2hcl (aq) —> 2h2o(l) + mgcl(aq) for 0.40 mole of mg(oh)2, 0.20 mol of hcl will be needed.

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?

Which is true of a liquid? it has a definite volume but not a definite mass.it has a definite mass but not a definite volume.it has a definite volume but not a definite shape.it has a definite shape but not a definite volume.

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit