Consider the balanced reaction bellow. how many moles of barium hydroxide,ba(oh)2, would be required to react with 117g hydrogen bromide,2hbr+ba(oh)2=babr2+2h2

Mol of HBr = mass/Mr = 117/(1+80) = 1.444 From equation, 2 moles hydrogen bromide reacts with 1 mole of barium hydroxide So 1.444 moles of hydrogen bromide react with (1.444/2) = 0.722 moles of barium hydroxide.

Since the scientists found a fossil from a modern day badger from the Holocene geologic epoch, the badger would be mostly the same, as this is the most recent, and still on going geologic epoch, starting from little less than 12,000 years ago. If the scientist wants to find a fossilized remains of earlier badgers, thus of their ancestors from the Pleistocene epoch, than the scientist should dig deeper. Not a lot deeper though, as the layers of rock from the Pleistocene are just bellow the layers of rock from the Holocene, as the Pleistocene is the second youngest geologic epoch, being the predecessor of the Holocene.