Chemistry - Mole Concept Question with Solution | TestHub

ChemistryMole ConceptAtomic mass/Average Atomic Mass/Average Molecular MassMedium2 minQB

ChemistryMediummultiple choice

An elements has three isotopes $X^{20}, X^{21}$ and $X^{22}$ . Percentage abundance (mole%) of $X^{20}$ is 90 and average atomic mass of $X$ is 20.18 . Select correct option(s) -

Options:(select one or more)

Answer:

B, C

Solution:

Explain Question: Find the correct options.

Concept: $M_{a vg .} = \frac{M _{1} x _{1} + M _{2} x _{2} + M _{3} x _{3}}{100}$

Solution:

X²⁰ = 90%

X²¹ = x%

X²² = (10 – x)%

$M_{a vg .} = 20.18 = \frac{90 ( 20 ) + x ( 21 ) + ( 10 - x ) ( 22 )}{100}$

x = 2%

X²¹ % = 2%

X²² % = 8%

Final Answer: (BC)

Stream:JEESubject:ChemistryTopic:Mole ConceptSubtopic:Atomic mass/Average Atomic Mass/Average Molecular Mass

⏱ 2mℹ️ Source: QB

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