Question

what is the molar mass of Mn, Fe, and O4?

Answer 1

you get the molar mass from the periodic table

Answer 2

the molar mass is the bigger number either above or below the element on the periodic table because some are above and some are below

Answer 3

for the O4 since you have 4 oxygens, you multiply the molar mass of oxygen by 4

Answer 4

Fe= 55.8452 ± 0.0001 g/mol
Mn= 54.9380455 ± 0.0000001 g/mol
O4..15.99943 ± 0.00001 g/mol (multiply it by 4 since yo have 4 oxygens. you could also check the molar mass on the periodic table