99 Percentile Qs Bank for JEE MainChemistrySome Basic Concepts of Chemistry
A compound which contains one atom of X , two atoms of Y and three atoms of Z , is made by mixing 5   g of X , 1 . 15 × 10 23   atoms of Y and 0 . 03   mole of Z atoms. Given that only 4 . 40   g of compound results. Calculate the atomic mass of Y if atomic masses of X   &   Z are 60   &   80   amu , respectively
Options
- AY = 70
- BY = 60
- CY = 50
- DY = 40
Correct answer
A. Y = 70
Step-by-step solution
X + 2 Y + 3 Z ⟶ X Y 2 Z 3 Moles 5 6 0 1 · 1 5 × 1 0 2 3 6 · 0 2 3 × 1 0 2 3 0 · 0 3 ⇒ 0 · 0 8 3 3 0 · 1 9 1 0 · 0 3 Moles Coefficient 0 · 0 8 3 3 1 0 · 1 9 1 2 0 · 0 3 1 = 0 · 0 8 3 3 0 · 0 9 5 0 0 · 0 3 ∴   Z is limiting reagent and 0 . 03   moles of Z will given 0 . 01   mole XY 2 Z 3 0 · 0 1  mole ≡ 4 · 4 0  g 1  mole = 4 4 0  g / mole 4 4 0 = 6 0 + 2 X  Y + 3 × 8