Can you calculate the molar mass of each?

Can you please show me step by step on how to get these answers?

O2
KH2PO4
C4H8O4
KBrO4
Fe(ClO4)3
Ga2(CO3)3

Answer:
use periodic table and add up the molecular weight of each element in the formula

O2 means 2 oxygens
each oxygen is 16
therefore O2 weighs 32

Fe (ClO4)3
1 Fe
3 Cl and 12 O in this formula
its pretty simple holly D. First you need to learn what atomic mass is. Oxygens atomic mass is like 15.9994 or 16. Since subscript is 2 u multiply 16 by which gives you 32. Same thing is applied for the other problems . All you just do is add everthing up and you get the molar mass of the given equation. Hope this helps :D

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