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Copper has two naturally occurring isotopes ${}^{63}{Cu} and {}^{65}{Cu}$ . If the average atomic mass of copper is $63.546 u$ , then natural abundance of lighter isotope of $Cu$ will be

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Important Questions on Some Basic Concepts of Chemistry

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

Which symbol replaced the unit of atomic mass, amu?

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

One mole of dioxygen gas at

STP

is equal to

EASY

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

Tabulate differences between Gram-atomic mass and relative atomic mass.

HARD

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

What is the significance of molecular formula?

MEDIUM

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

The atomic mass of uranium is

238

. How many times is the atom of uranium heavier than the carbon atom?

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.

MEDIUM

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

Define relative molecular mass.

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

The relative abundance of two isotopes of atomic weight

85 and 87

75 % and 25 %

respectively. The average atomic weight of element is

MEDIUM

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

How will you calculate molar mass of a substance and number of moles of a substance?

EASY

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

Define gram-molecular mass.

MEDIUM

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

Define molecular mass and relative molecular mass.

MEDIUM

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

The number of times a molecule of a molecular compound is heavier than

\frac{1}{12}

part of

{}^{12}C

is called:

HARD

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

Compute the difference in masses of

10^{3}

moles each of magnesium atoms and magnesium ions.
(Mass of an electron =

9.1 \times 10^{- 31}

kg)

EASY

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

Number of atoms of He in 100 u of He (atomic weight of He is 4) are

EASY

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

If we consider that

\frac{1}{6},

in place of

\frac{1}{12}

, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

EASY

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

What do you understand by the term molecular mass?

EASY

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

The mass of a single molecule of water is _____

\times 10^{- 23} g

(1.89, 3.69, 2.99)

EASY

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

The unit of molar mass is _____

{mol}^{- 1}

(g, mg)

EASY

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

Calculate the charge in coulombs in 1 gram of Azide anion

Copper has two naturally occurring isotopes Cu63 and Cu65. If the average atomic mass of copper is 63.546 u, then natural abundance of lighter isotope of Cu will be

Important Questions on Some Basic Concepts of Chemistry

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Copper has two naturally occurring isotopes ${}^{63}{Cu} and {}^{65}{Cu}$ . If the average atomic mass of copper is $63.546 u$ , then natural abundance of lighter isotope of $Cu$ will be