MHT CET202013 Oct 2020Evening ShiftChemistrySome Basic Concepts of ChemistryActual
What is the number of moles and total number of atoms respectively present in 5 6 ~cm ³ of ammonia gas at STP?
Options
- A2 50 10⁻³ ~mol and 1 5 10²⁰ atoms
- B1.505 ~mol and 6.022 10²⁰ atoms
- C2 05 ~mol and 1 50 10²⁰ atoms
- D2 50 10⁻⁴ ~mol and 6 022 10²⁰ atoms
Correct answer
D. 2 50 10⁻⁴ ~mol and 6 022 10²⁰ atoms
Step-by-step solution
Vol. of NH ₃ gas at STP =5.6 ~cm ³=5.6 10⁻³ dm ³ Now 22.4 dm ³ of NH ₃=1 mole of NH ₃ at STP 5.6 10⁻³ dm ³ of NH ₃= 5.6 10⁻³ 22.4 =2.5 10⁻⁴ ~mol of NH ₃ Now, No. of atoms =2.5 10⁻⁴ 6.022 10²¹ 4=6.022 10²⁰ atoms