At the same conditions of temperature and pressure, 5.0 dm^3 of a gas of molecular formula C_2 H_2, has a mass of 15 g, while 1.0 dm^3 of gas D has a mass of 1.4 g. What is the molar mass of gas D? Underscore means subscript but I can't get the equation thingy to work. So it's meant to be C(subscript 2)H(subscript 2)
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At the same conditions of temperature and pressure, 5.0 dm^3 of a gas of molecular formula C_2 H_2,...
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