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i dont know how to remove my answer so ignore this
I'm guessing it's C-Oxygen because in order to burn something, or create fire, oxygen HAS to be present.
0.295 * 203 = 53.885
0.705 * 205 = 144.525
53.885 + 144.525 = 204.41
The relative atomic mass of Thallium is 204.41
Answer:
The molar mass and molecular weight of Sn(CO3)2 is 238.728.
Explanation: