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From the equation: 2C2h2(g)+5O2(g)-4co2(g)+2H2O(g) Molar mass: 2c2h2 4co2 26 44 2mol 4mole Amount of c2h2 reacted=n=m/M n=molar mass/reacting mass n=104/26=4 moles 2 moles of c2h2 gives 4moles of co2 4 moles of c2h2 produces: 2-----------4 4-----------x