Use the value of the Avogadro constant 6 . 02 × 10 23 mol - 1 to calculate the total number of atoms in 7 . 10 g of chlorine atoms. ( A r value: Cl = 35 . 5 ).

One mole of a substance is equal to 6 . 02 × 10 23 units of that substance (such as atoms, molecules, or ions). The number 6 . 02 × 10 23 is known as Avogadro number or Avogadro constant. The concept of the mole can be used to convert between mass and number of particles To find the number atoms in the given mass we need to calculate number of moles for given mass, we know that, Number of moles = Mass of substance Molar mass = 7 . 10 71 . 0 = 0 . 1 mol So, total number of atoms of chlorine present in 7 . 10 g 0 . 1 mol are, = 0 . 1 × 6 . 02 × 10 23 = 0 . 602 × 10 23 .

E M B I B E

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 3 - Atoms, Molecules and Stoichiometry>Question

Lawrie Ryan and Roger Norris Solutions for Chapter: Atoms, Molecules and Stoichiometry, Exercise 7: Question

Author:Lawrie Ryan & Roger Norris

Lawrie Ryan Chemistry Solutions for Exercise - Lawrie Ryan and Roger Norris Solutions for Chapter: Atoms, Molecules and Stoichiometry, Exercise 7: Question

Attempt the free practice questions on Chapter 3: Atoms, Molecules and Stoichiometry, Exercise 7: Question with hints and solutions to strengthen your understanding. Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years) solutions are prepared by Experienced Embibe Experts.

Questions from Lawrie Ryan and Roger Norris Solutions for Chapter: Atoms, Molecules and Stoichiometry, Exercise 7: Question with Hints & Solutions

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AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 3 - Atoms, Molecules and Stoichiometry>Question>Q 6

Use the $A_{r}$ value of sulphur is $32.1$ to calculate the amount of substance in moles in $10.7 g$ of sulphur atoms.

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 3 - Atoms, Molecules and Stoichiometry>Question>Q 6

Use the $A_{r}$ value of sulphur is $32.1$ to calculate the amount of substance in moles in $64.2 g$ of sulphur molecules $(S_{8})$ .

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AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 3 - Atoms, Molecules and Stoichiometry>Question>Q 6

Use these $A_{r}$ values $(Fe = 55.8, N = 14.0, O = 16.0)$ to calculate the amount of substance in moles in $60.45 g$ of anhydrous iron(III) nitrate, $Fe {({NO}_{3})}_{3}$ .

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 3 - Atoms, Molecules and Stoichiometry>Question>Q 6

Use the value of the Avogadro constant $(6.02 \times 10^{23} {mol}^{- 1})$ to calculate the total number of atoms in $7.10 g$ of chlorine atoms. ( $A_{r}$ value: $Cl = 35.5$ ).

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