In the reaction A2 + 2ab2 = 4AB, 1g & nbsp; A2 reacts with enough AB2 to produce 5g AB, then the ratio of molecular weight of A2 to AB2 is () A. 3：4B. 4：3C. 1：2D. 2：1

According to the law of conservation of mass, the mass of AB2 is: ab mass - A2 mass = 5g-1g = 4G; let the relative molecular mass of A2 and AB2 be x and YA2 + 2ab2 = 4abx & nbsp; 2y1g & nbsp; 4gx2y = 1g4g4xy = 12, so C is selected

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