Suppose two elements X and Y combine to form two compounds X Y 2 and X 2 Y 3 . If 0.05 mole of X Y 2 weighs 5g while 3.01 × 1 0 23 molecules of X 2 Y 3 weighs 85 g , then atomic masses of X and Y are respectively :

0.05 m o lX Y 2 = 5 g m 1 m o lX Y 2 X + 2 Y 3.01 × 1 0 23 m o l ec u l e X 2 Y 3 1 m o l X 2 Y 3 2 X + 3 Y = 0.05 5 = 100 = 100 … . ( i ) = 85 g m = N A m o l ec u l e = 170 g m = 170 … .. ( ii ) On solving, X = 40 , Y = 30

Chemistry - Mole Concept Question with Solution | TestHub

ChemistryMole ConceptExpetimental Determination of Atomic Mass/Molecuair massMedium2 minQB

ChemistryMediumsingle choice

Suppose two elements $X$ and $Y$ combine to form two compounds $X Y_{2}$ and $X_{2} Y_{3}$ . If 0.05 mole of $X Y_{2}$ weighs 5g while $3.01 \times 1 0^{23}$ molecules of $X_{2} Y_{3}$ weighs 85 g , then atomic masses of $X$ and $Y$ are respectively :

Options:

Answer:

Solution:

$0.05 m o lX Y_{2} = 5 g m$

$1 m o lX Y_{2} X + 2 Y 3.01 \times 1 0^{23} m o l ec u l e X_{2} Y_{3} 1 m o l X_{2} Y_{3} 2 X + 3 Y = \frac{5}{0.05} = 100 = 100 \dots . (i) = 85 g m = N_{A} m o l ec u l e = 170 g m = 170 \dots .. (ii)$

On solving,

$X = 40, Y = 30$

Stream:JEESubject:ChemistryTopic:Mole ConceptSubtopic:Expetimental Determination of Atomic Mass/Molecuair mass

⏱ 2mℹ️ Source: QB

Doubts & Discussion

Loading discussions...