Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 201912 AprilMorning Shift
Exam
JEE Main
Year
2019
Date
12 April
Shift
Morning Shift
Subject
Chemistry
Chapter
Some Basic Concepts of Chemistry

JEE Main 2019 · 12 April · Morning Shift · Chemistry · Some Basic Concepts of Chemistry

5 moles of A B _ 2 weigh 125 × 10 ^ - 3 kg and 10 moles of A _ 2 B...

55 moles of AB2A{B}_{2} weigh 125×10−3kg125 \times {10}^{- 3}kg and 1010 moles of A2B2{A}_{2}{B}_{2} weigh 300×10−3kg300 \times {10}^{- 3}kg . The molar mass of A (MA)( {M}_{A} ) in kgmol−1kg{mol}^{- 1} are:5 moles of A B _ 2 weigh 125 × 10 ^ - 3 kg and 10 moles of A _ 2 B _ 2 weigh 300 × 10 ^ - 3 kg . The molar mass of A (

Options

  1. AMA=5×10−3{M}_{A} = 5 \times {10}^{- 3} and MB=10×10−3{M}_{B} = 10 \times {10}^{- 3}
  2. BMA=25×10−3{M}_{A} = 25 \times {10}^{- 3} and MB=50×10−3{M}_{B} = 50 \times {10}^{- 3}
  3. CMA=50×10−3{M}_{A} = 50 \times {10}^{- 3} and MB=25×10−3{M}_{B} = 25 \times {10}^{- 3}
  4. DMA=10×10−3{M}_{A} = 10 \times {10}^{- 3} and MB=5×10−3{M}_{B} = 5 \times {10}^{- 3}

Correct answer

A. MA=5×10−3{M}_{A} = 5 \times {10}^{- 3} and MB=10×10−3{M}_{B} = 10 \times {10}^{- 3}

Step-by-step solution

Mass of 1 mole of AB2=125×10−3kg5=125gm5{AB}_{2} = \dfrac{125 \times {10}^{- 3}kg}{5} = \dfrac{125gm}{5}
=25gm= 25gm

Similarly, mass of 11 mole of A2B2=300×10−3kg10=30gm{A}_{2}{B}_{2} = \dfrac{300 \times {10}^{- 3}kg}{10} = 30gm

Let molar mass of AA is xx and BB is yy
5 moles of A B _ 2 weigh 125 × 10 ^ - 3 kg and 10 moles of A _ 2 B _ 2 weigh 300 × 10 ^ - 3 kg . The molar mass of A (

Practice Some Basic Concepts of Chemistry on Quantrex Academy →

More from Some Basic Concepts of Chemistry

Match List-I with List-II. List-I Mass of substance List-II Number of atoms A. 1.8 mg… JEE Main 2026Which of the following contain the same number of atoms ? (Given : Molar mass in g mol ^… JEE Main 2026An oxide of iron contains 69.9\% iron, its empirical formula, is: (Given: Molar mass of… JEE Main 2026What volume of hydrogen gas at STP would be liberated by action of 50 mL of H_2SO_4 of… JEE Main 2026How many grams of residue is obtained by heating 2.76 g of silver carbonate? (Given… JEE Main 2026The correct order of total number of atoms present in (A) 2 moles of cyclohexane (B) 684… JEE Main 2026Number of moles and number of molecules in 1.4187 L of SO_2 at STP respectively are: JEE Main 2026The ratio of mass percentage (w/w) of C : H in a hydrocarbon is 12 : 1 . It has two… JEE Main 2026 Full Some Basic Concepts of Chemistry list All JEE Main PYQs