How many grams are in 102 moles of magnesium?

In apex! a liquid heated beyond a certain temperature becomes

You wish to prepare a buffer consisting of acetic acid and sodium acetate with a total acetic acetate plus acetate concentration of 250 mm and a ph of 5. what concentrations of acetic acid and sodium acetate should you use

Which number should be placed before f2 on the reactants side equation to make equation balanced? xe + > xef4