19. If the reaction of 5.87 moles of potassium with excess hydrobromic acid produced an 84.89% yleld of hydrogen gas, what was the actual yield of hydrogen gas? Unbalanced equation: K+ HBr
KBr + H2 (2 points)
O 4.98 mol H2
O 3.47 mol H2
O 2.94 mol Hz
O 249 mol H2

What will most likely happen in the absence of a cell membrane? a) photosynthesis will not take place. b) the cell will not store food, water, nutrients, and waste. c) energy will not be released during cellular respiration. d) substances will pass in and out of the cell in an uncontrolled manner.