Mole Concept and Molar Masses

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Mole Concept and Molar Masses: Overview

This topic covers concepts, such as, Mole Concept, Calculation of Number of Moles from Given Parameters, Relation between Empirical Formula and Molecular Formula & Avogadro Number etc.

Important Questions on Mole Concept and Molar Masses

HARD

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 1

The composition of a sample of wustite is ${Fe}_{0 .93} O_{1 .00}$ . What percentage of iron is present in the form of Fe (III)?

HARD

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 2

An organic compound A contains $69.77 %$ carbon, $11.63 %$ hydrogen and the rest is oxygen. The molecular mass of the compound is $86$ . It does not reduce Tollen’s reagent but forms an addition product with sodium hydrogen sulphite and gives positive iodoform test. On vigorous oxidation it gives ethanoic and propanoic acids. The compound A is:

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 3

The number of oxygen atoms in $4 .4 g$ of ${CO}_{2}$ is:

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 4

The number of oxygen atoms in $4.4$ gram of $C O_{2}$ is
(Given that atomic mass $C$ and $O$ are $12$ and $16$ $g/mol$ )

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 5

Ratio of $C_{p} a n d C_{v}$ of a gas 'X' is 1.4. The number of atoms of the gas ‘X’ present in 11.2 litres of it at NTP will be

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 6

Which has the maximum number of molecules among the following?

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 7

Which has the maximum number of molecules among the following?

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 8

The number of atoms in $0.1$ moles of a triatomic gas is:

$(N_{A} = 6 .023 \times 10^{23} {mol}^{- 1})$

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 9

An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave $C, 38.71 %$ and $H, 9.67 %$ . The empirical formula of the compound would be:

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 10

$1 cc N_{2} O at NTP$ contains:

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 11

The maximum number of molecules are present in:

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 12

Which has maximum number of molecules?

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 13

Which has maximum number of molecules?

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 14

An organic compound containing $C, H a n d O$ gave on analysis $C - 40 % a n d H - 6.66 % .$ Its empirical formula would be:

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 15

Haemoglobin contains $0.334 %$ of iron by weight. The molecular weight of haemoglobin is approximately $67200.$ The number if iron atoms (atomic weight of Fe is 56) present in one molecule of haemoglobin are:

MEDIUM

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 16

An organic compound containing $C, H and N$ gave the following analysis:

$C = 40 %; H = 13 .33 %; N = 46 .67 %$

Its empirical formula would be:

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 17

The percentage weight of Zn in white vitriol $[Z n S O_{4} . 7 H_{2} O]$ is approximately equal to $(Z n = 65, S = 32, O = 16 a n d H = 1)$

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 18

If $N_{A}$ is Avogadro’s number then number of valence electrons in 4.2 g of nitride ions $(N^{3 -}) i s$

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 19

In a compound C, H, N atoms are present in the ratio 9 : 1 : 3.5 by mass. If molecular mass of the compound is 108, then molecular formula of the compound is

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Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses> Q 20

In a compound C, H, N atoms are present in the ratio 9 : 1 : 3.5 by mass. If molecular mass of the compound is 108, then molecular formula of the compound is

Mole Concept and Molar Masses

Mole Concept and Molar Masses: Overview

Important Questions on Mole Concept and Molar Masses

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