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In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

Select the correct answer. given: 2libr + ba → babr2 + 2li in this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced? a. 1.18 mol b. 2.37 mol c. 4.73 mol d. 16.4 mol e. 32.9 mol

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.