Which of the following gases has the same mass? (R.A.M: H, 1; C, 12; N, 14; O, 16; 1 mol of gas occupies 24 dm^3 at room temperature and pressure)
A 4.8 dm^3 NO2 = 6.9 g
B 3.6 dm^3 CO2 = 5.5 g
C 18 dm^3 CH4 = 12 g
D 12 dm^3 NH3 = 3.4 g
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The answer is C
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