Answer:
Janelle and Marcus and their group went to the library to prepare for the presentation, but the specific book they needed wasn't there.
Describing the character’s physical appearance
From my understanding all you are doing is converting liters to grams. It says you have one leader of hydrogen peroxide. 1 liter equals 1000 grams. And if it is asking how many grams are in 1 liter hydrogen peroxide then the answer would be 1000 grams
I'm not sure, I'd go for hushed in awe or your answer