The element A at wt = 75 and B at wt. = 32 combine to form a compund X . If 3 mol of B combine with 2 mol of A to give 1 mol of X , the weight of 5 mol of X is?

1.23kg
 
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A wt. =75 ; B wt. =32 According to ques. 3B+2A=X So, according to LAW OF CONSERVATION OF MASS both sides have equal masses Therefore, 3*32+2*75= 246 Mass 1 mole of X =246 So 5 moles = 246*5 = 1230 gm or amu and 1.23 kg.
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