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According to law of conservation of mass the mass of D formed is 7g
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Given : 
5g of A reacts with 6g B 
⇒ C and D are formed where C is 4g 

need to find out : 
the weight of D

solution : 
according to the law of conservation of mass - 
⇒ mass of products = mass of reactants of chemical reaction 

mass of reactants = 5g + 6g 
                              = 11g 

let the weight of D be X 
⇒ 4g + X = 11g 
⇒ X = 11g - 4g 
⇒ X = 7g 

∴ the weight of D = 7g
2 5 2
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