In the pictures below, solid circles () represent atoms of element X. Hollow circles (0) represent atoms of element Y. Molecules such as X2 are represented by adjoining circles. The box below shows the reaction: X2+3Y22XY3 The second box shows the same reaction, but modified by adding excess X2, so that the left-most part of the reaction looked as pictured below: Which of the following pictures would best complete the sequence? For the reaction shown in the previous problem, X2 has a molecular weight of 71g/mol and Y2 has a molecular weight of 160g/mol. If 10g of X2 and 30g of Y2 react as much as they can, how much of the starting reagents will be leftover? None; all reagents are used completely. 5.6g of X2 will be leftover 7.5g of Y2 will be leftover 20g of Y2 will be leftover 5.6g of X2 and 7.5g of Y2 will be leftover I don't know how to approach or answer this