Answer: C. At room temperature and pressure one mole of gas occupies 24 dm³, so 12 dm³ is 0.5 mol. A mass of 28 g for 0.5 mol gives a relative molecular mass of 56.
\(\text{C}_4\text{H}_8\) has \(M_r = 48 + 8 = 56\), which matches.
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