CBSE (Science) Class 11CBSE
Share

# Find (A) the Total Number and (B) the Total Mass of Protons in 34 Mg of Nh3 At Stp. Will the Answer Change If the Temperature and Pressure Are Changed - CBSE (Science) Class 11 - Chemistry

ConceptSubatomic Particles Discovery of Protons and Neutrons

#### Question

Find (a) the total number and (b) the total mass of protons in 34 mg of NH3 at STP. Will the answer change if the temperature and pressure are changed?

#### Solution

(iii) (a) 1 mole of NH3 = {1(14) + 3(1)} g of NH3

= 17 g of NH3

= 6.022× 1023 molecules of NH3

Total number of protons present in 1 molecule of NH3

= {1(7) + 3(1)}

= 10

Number of protons in 6.023 × 1023 molecules of NH3

= (6.023 × 1023) (10)

= 6.023 × 1024

⇒ 17 g of NH3 contains (6.023 × 1024) protons.

Number of protons in 34 mg of NH3

= (6.022 xx 10^24 xx 34 mg)/17000mg

= 1.2046 × 1022

(b) Mass of one proton = 1.67493 × 10–27 kg

Total mass of protons in 34 mg of NH3

= (1.67493 × 10–27 kg) (1.2046 × 1022)

= 2.0176 × 10–5 kg

The number of protons, electrons, and neutrons in an atom is independent of temperature and pressure conditions. Hence, the obtained values will remain unchanged if the temperature and pressure is changed

Is there an error in this question or solution?

#### APPEARS IN

NCERT Solution for Chemistry Textbook for Class 11 (2018 to Current)
Chapter 2: Structure of Atom
Q: 2.3 | Page no. 65

#### Video TutorialsVIEW ALL 

Solution Find (A) the Total Number and (B) the Total Mass of Protons in 34 Mg of Nh3 At Stp. Will the Answer Change If the Temperature and Pressure Are Changed Concept: Subatomic Particles - Discovery of Protons and Neutrons.
S