How to calculate the mass of carbon in carbon dioxide
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You use the relative atomic mass of the atoms.
Carbon has a relative atomic atomic mass of 12. Oxygen has a relative atomic mass of 16, so two of them is 32.
Hence in whichever mass CO₂ you choose, there will be (12 ÷ (12 + 32)) × 100% = 27.3% to 3sf.
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CO2 where C = Carbon = 6×2 = 12
O = Oxygen = 8×2×2 =32
the the mass of carbon in carbon dioxide = 12+ 32 = 44
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