[Solved] (i) Calculate the total number of electrons present in one mole of methane. (ii) Find (a) the total number and (b) the total mass of neutrons in 7 mg of 14C.(Assume that mass of a neutron =1.675×10−27kg).(iii) 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? - Chemistry Part-I

Name: Video solution 1: [Solved] (i) Calculate the total number of electrons present in one mole of methane. (ii) Find (a) the total number and (b) the total mass of neutrons in 7 mg of 14C.(Assume that mass of a neutron =1.675×10−27kg).(iii) 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? - Chemistry Part-I
Uploaded: 2022-09-22T12:23:42.000Z
Duration: 5 min

(i) Total number of electrons present in 1 methane molecule =6+4=10.Total number of electrons resent in 1 mole of methane =10×6.023×1023=6.023×1024 electrons.The number of neutrons is equal to the difference in the mass number and atomic number.It is equal to 14−6=8.(ii)(a) The number of neutrons present in 7 mg of C-14 is 146.023×1023×8×7×1010−3=2.4088×1021 neutrons.(b) Total mass of neutrons in 7 mg of C-14 is 2.4088 ×1021×1.675×10−274.035×10−6 kg.(iii)(a)Number of protons present in 1 molecule of ammonia =7+3=10.Number of molecules present in 34 mg of ammonia is 176.023×1023×34×10−3=1.2044×1021.Total number of protons present in 34 mg of ammonia=10×1.2044×1021=1.2044×1022(b) Total mass of protons present in 34 mg of ammonia at STP is 1.6726×10−27×1.204×1022=2.0138×10−5 kg.When temperature and pressure are changed, there is no difference in the answer.

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Chemistry Part-I

Structure of Atom

(i) Calculate the total number of electrons present in one mol

Chemistry Part-I

Class 11

NCERT

Chapter 1: Some Basic Concepts of Chemistry

44 questions

Chapter 2: Structure of Atom

85 questions

(i) Calculate the number of electrons which will together weighs one gram.
(ii) Calculate the mass and charge of one mole of electrons.

(i) Calculate the total number of electrons present in one mole of methane.

(ii) Find (a) the total number and (b) the total mass of neutrons in 7 mg of

^{14} C

.
(Assume that mass of a neutron =

1.675 \times 10^{- 27} k g

(iii) Find (a) the total number and (b) the total mass of protons in 34 mg of

N H_{3}

at STP.
Will the answer change if the temperature and pressure are changed?

Calculate the wavelength of an electron moving with a velocity of

2.05 \times 10^{7} m s^{- 1}

View all question

Chapter 3: Classification of Elements and Periodicity in Properties

50 questions

Chapter 4: Chemical Bonding and Molecular Structure

44 questions

Chapter 5: States of Matter

28 questions

Chapter 6: Thermodynamics and Thermochemistry

36 questions

Chapter 7: Equilibrium

101 questions

Question

Medium

Solving time: 8 mins

(i) Calculate the total number of electrons present in one mole of methane.

(ii) Find (a) the total number and (b) the total mass of neutrons in 7 mg of $^{14} C$ .
(Assume that mass of a neutron = $1.675 \times 10^{- 27} k g$ ).

(iii) Find (a) the total number and (b) the total mass of protons in 34 mg of $N H_{3}$ at STP.
Will the answer change if the temperature and pressure are changed?

Views: 5,508 students

Updated on: Sep 27, 2022

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Chemistry Part-I (NCERT)

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(i) Calculate the total number of electrons present in one mole of methane.

(ii) Find (a) the total number and (b) the total mass of neutrons in 7 mg of

^{14} C

.
(Assume that mass of a neutron =

1.675 \times 10^{- 27} k g

(iii) Find (a) the total number and (b) the total mass of protons in 34 mg of

N H_{3}

at STP.
Will the answer change if the temperature and pressure are changed?

9 mins ago

Discuss this question LIVE

9 mins ago

Text solutionVerified

(i) Total number of electrons present in 1 methane molecule

= 6 + 4 = 10

Total number of electrons resent in 1 mole of methane

= 10 \times 6.023 \times 1 0^{23} = 6.023 \times 1 0^{24}

electrons.

The number of neutrons is equal to the difference in the mass number and atomic number.
It is equal to

14 - 6 = 8

(ii)(a) The number of neutrons present in 7 mg of C-14 is

\frac{6.023 \times 1 0 ^{23} \times 8}{14} \times 7 \times 1 0^{10 - 3} = 2.4088 \times 1 0^{21}

neutrons.

(b) Total mass of neutrons in 7 mg of C-14 is

2.4088 \times 1 0^{21} \times 1.675 \times 1 0^{- 27} 4.035 \times 1 0^{- 6}

kg.

(iii)(a)Number of protons present in 1 molecule of ammonia

= 7 + 3 = 10

Number of molecules present in 34 mg of ammonia is

\frac{6.023 \times 1 0 ^{23} \times 34 \times 1 0 ^{- 3}}{17} = 1.2044 \times 1 0^{21}

Total number of protons present in 34 mg of ammonia

= 10 \times 1.2044 \times 1 0^{21} = 1.2044 \times 1 0^{22}

(b) Total mass of protons present in 34 mg of ammonia at STP is

1.6726 \times 1 0^{- 27} \times 1.204 \times 1 0^{22} = 2.0138 \times 1 0^{- 5}

kg.

When temperature and pressure are changed, there is no difference in the answer.

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Practice more questions from Chemistry Part-I (NCERT)

(i) Calculate the number of electrons which will together weighs one gram.
(ii) Calculate the mass and charge of one mole of electrons.

(i) Calculate the total number of electrons present in one mole of methane.

(ii) Find (a) the total number and (b) the total mass of neutrons in 7 mg of

^{14} C

.
(Assume that mass of a neutron =

1.675 \times 10^{- 27} k g

(iii) Find (a) the total number and (b) the total mass of protons in 34 mg of

N H_{3}

at STP.
Will the answer change if the temperature and pressure are changed?

Calculate the wavelength of an electron moving with a velocity of

2.05 \times 10^{7} m s^{- 1}

View all

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Question Text	(i) Calculate the total number of electrons present in one mole of methane. (ii) Find (a) the total number and (b) the total mass of neutrons in 7 mg of $^{14} C$ . (Assume that mass of a neutron = $1.675 \times 10^{- 27} k g$ ). (iii) Find (a) the total number and (b) the total mass of protons in 34 mg of $N H_{3}$ at STP. Will the answer change if the temperature and pressure are changed?
Updated On	Sep 27, 2022
Topic	Structure of Atom
Subject	Chemistry
Class	Class 11
Answer Type	Text solution:1 Video solution: 2
Upvotes	341
Avg. Video Duration	5 min

Text solutionVerified

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