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Grade: 9
        p and Q are two elements which forms P2 Q3 and PQ2 it 0.15 mole of P2Q3 weight 5.9 grams and 0.15 mole of PQ2 9.3gm. what are atomic weights of PandQ
10 months ago

Answers : (1)

Arun
14891 Points
							

0.15 moles of P2Q3 weighs 15.9 g

Therefore , 1 moles of P2Q3 weigh 106 g

Now, 0.15 moles of PQ2 weigh 9.3 gn

1 mole of PQ2 will weigh 62 g

Now, 2P + 3Q = 106 --- (i)

Also, P + 2Q = 62----(ii)

2P + 4Q = 124 --- (iii)

(iii) - (i)

2P + 4Q - ( 2P + 3 Q) = 124 - 106

Q = 18 , P = 26

Ans: Q = 18 , P = 26

10 months ago
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