An element P combines with another element Q in the weight ratio 1: 5. If 15 g of P is made to react with 62g of Q to a compound. What will be the total weight of the new compound formed?
(A) 60 g
(B) 77 g
(C) 74.4 g
(D) 74 g
(E) 66 g

Correct answer is option c i.e. total weight of compound  = .

Explanation:

We have, an element P combines with another element Q in the weight ratio 1: 5. In the given situation , 15 g of P is made to react with 62 g of Q , Since both compounds are in ratio of 1:5 , According to for 15 g of P , (15×5)g of Q should be available i.e. 15 g of P requires 75 g of Q but in question we have 62 g of Q compound . Since, ratio of weight pf P:Q must be 1:5 , And so, for 62 g of Q  ()g of P is required .

Now, total weight of compound  = Amount of P + Amount of Q

⇒  total weight of compound  =

⇒  total weight of compound  =

In this question , all compound Q is used but , P is unused as 12.4 g , So amount of P unused = 15-12.4 = 2.6 g.

∴Correct answer is option c i.e. total weight of compound  = .

c.

explanation: