Answer:

Explanation:
number of moles of C8H9NO2 = 
The trick is to remember to convert milligrams to grams because molar mass is normally presented in grams per mole
Answer:
B
Explanation:
Because element is made up of only one type of atoms and figure b show only one type of atoms.
Answer:
yes it is and sometimes it's not
Salad, a bag of different colored pebbles or sand, etc
Option C: Sulfur Dioxide is the answer
Hope this helps