Which one is heavier, 1 mole of C O 2 or 1 mole of C O ?

We know that, the mass of one mole of a substance is equal to that substance's molecular weight. Therefore, 1 mole of C O 2 is heavier than 1 mole of C O , because 1 mole of C O 2 = 44 gram/mole and 1 mole of C O = 28 gram/mole.

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If the table of atomic masses were established with the oxygen atom and assigned value of 200, then the mass of carbon atom would be, approximately:

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Important Questions on Some Basic Concepts of Chemistry

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

The unit of atomic mass,

amu

is replaced by

u

, here

u

stands for

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

Which symbol replaced the unit of atomic mass, amu?

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

Consider an imaginary ion

{}_{22}^{48}X^{3 -}

. The nucleus contains '

a

%

more neutrons than the number of electrons in the ion. The value of '

a

' is

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

The average molar mass of chlorine is

35.5 g {mol}^{- 1}

. The ratio of

{}^{35}{Cl}

{}^{37}{Cl}

in naturally occurring chlorine is close to :

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

Natural abundances of

^{12} C

and

^{13} C

isotopes of carbon are

99 %

and

1 %

respectively. Assuming they only contributes to the molecular weight of

C_{2} F_{4}

, the percentage of

C_{2} F_{4}

having a molecular mass of

101

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

Two elements

A

and

B

which form

0.15

moles of

A_{2} B

and

{AB}_{3}

type compounds. If one mole of each

A_{2} B

and

{AB}_{3}

weigh equally, then the atomic weight of

A

is____times of atomic weight of

B

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

Chlorine has two naturally occurring isotopes.

^{35} C l

and

^{37} C l

. If the atomic mass if

C l

is 35.45, the ratio of natural abundance of

^{35} C l

and

^{37} C l

is closest to

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

What will be the mass of one atom of

{}^{12}C

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

A plant virus is found to consist of uniform cylindrical particles of 150

Å

in diameter and 5000

Å

long. The specific volume of the virus is 0.75 cm³/g. If the virus is considered to be a single particle, find its molar mass

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

Represent the union of two sets by Venn diagram for each of the following.

$X = {x | x$ is a prime number between $80$ and $100}$

$Y = {y | y$ is an odd number between $90$ and $100}$

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

Suppose 1/4^th part by weight of an atom of He⁴ isotope is taken as 1u rather than the present convention, then what will be the expected atomic weight of Al on this scale? (Atomic weight of Al, C and He on C¹² - scale are 27, 12 and 4.003 respectively)

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

A gas is found to have a formula

[C O]_{x}

. If its vapour density is

70

, the value of

x

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

There are two isotopes of an element with atomic mass

z

. Heavier one has atomic mass

z + 2

and lighter one has

z - 1

, the abundance of lighter one is

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

Which one is heavier,

1

mole of

{C O}_{2}

1

mole of

C O

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

3.011 \times 10^{22}

atoms of an element weigh

1.15 gm

. The atomic mass of the element is.

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

Why atomic mass is an average value? Explain with a suitable example.

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

If u was defined as

1 / 4

^th part by weight of an atom of

{He}^{4}

isotope rather than the present convention of

1 / 12

^th part by weight of an atom of

C^{12}

-isotope, atomic weight of Al on this scale would be -------. (Atomic weight of Al, C and He on

C^{12}

- scale are

27, 12 and 4.003

), respectively.

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

If molecular mass and atomic mass of sulphur are

256

and

32

respectively, its atomicity is

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

1.5 g of CdCl₂ was found to contain 0.9 g of Cd. Calculate the atomic weight of Cd.

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Mass

Accurate determination of atomic masses is done with the instrument called as-

If the table of atomic masses were established with the oxygen atom and assigned value of 200, then the mass of carbon atom would be, approximately:

Important Questions on Some Basic Concepts of Chemistry

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