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

74.4 grams of the new compound will be formed.

The weight ratio at which the two elements P and Q combines is 1:5. So for every 1 gram of P there is 5 grams of Q.

Here we are supplied with 15 grams of P. So Q needed for 15 grams of P is 75 grams which we don't have.

We are given with 62 grams of Q. So P needed for that amount of Q is 12.4 grams.

Thus the compound will weigh grams which will give us with 74.4 grams of compound.

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >