The relative mass of each element can be found from the periodic table (the larger number). For instance, P2O5, P = 31.0 O = 16.0, thus the formula mass (Mr) is 2(31) + 5(16) = 142 amu (atomic mass unit). I used a not really specific periodic table. Maybe your teacher is referring to open Schoology (a website where teacher can post files or announcements to students in his or her class). Sorry if i got something mistaken.
Answer:

Explanation:
Hello,
In this case, for the given reaction:

We find a 1:2 molar ratio between the acid and the base respectively, for that reason, at the equivalence point we find:

That in terms of concentrations and volumes we can compute the concentration of the acid solution:

Best regards.
Salad is biotic, it is made from plants and plants are alive.
biotic means alive
abiotic means not alive