It would be letter "B", positive. Anions are the ones with negative charges.
Answer:
D. 18.7 grams
Explanation:
The coefficients are the key.
Create a proportion with them, and the molar mass, and then solve for x:

Chemists use beakers, flasks, burets and pipets to measure the volume of liquids. Plz mark as brainliest
B) 6
one above one below and 2 on the left and right sides