What will be the mass of one C 12 atom in g ?

One mole of carbon atoms = 6.022 × 1 0 23 atoms of carbon = 12 g of carbon ∴ Mass of one C 12 atom = 12 gm 6 . 022 × 10 23 = 1 . 992 × 10 - 23 gm Thus, the required value is obtained.

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What is the weight of one atom of H in g ( $a t . w t . o f H = 1.008$ )?

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Important Questions on Atoms and Molecules

MEDIUM

Science>Chemistry>Atoms and Molecules>Atom

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

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Science>Chemistry>Atoms and Molecules>Atom

Which symbol replaced the unit of atomic mass, amu?

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Science>Chemistry>Atoms and Molecules>Atom

The common isotopes of carbon are

{}^{12}C

and

{}^{13}C

. The average mass of carbon is

12.01115 amu

. What is the abundance of the

{}^{13}C

isotope?

HARD

Science>Chemistry>Atoms and Molecules>Atom

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

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Science>Chemistry>Atoms and Molecules>Atom

The unit of atomic mass,

amu

is replaced by

u

, here

u

stands for

MEDIUM

Science>Chemistry>Atoms and Molecules>Atom

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

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Science>Chemistry>Atoms and Molecules>Atom

One mole of dioxygen gas at

STP

is equal to

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Science>Chemistry>Atoms and Molecules>Atom

What will be the mass of one atom of

{}^{12}C

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Science>Chemistry>Atoms and Molecules>Atom

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 :

MEDIUM

Science>Chemistry>Atoms and Molecules>Atom

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

Science>Chemistry>Atoms and Molecules>Atom

116 m g

of a compound on vaporisation in a Victor Meyer's apparatus displaces

44.8 m l

of air measured at S.T.P. The molecular weight of the compounds is

HARD

Science>Chemistry>Atoms and Molecules>Atom

An organic compound contains

69 %

carbon and

4.8 %

hydrogen, the remainder being oxygen. Calculate the masses of carbon dioxide and water produced when

0.20 g

of this substance is subjected to complete combustion.

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Science>Chemistry>Atoms and Molecules>Atom

The element whose gram-atomic mass and gram-molecular mass are the same is-

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Science>Chemistry>Atoms and Molecules>Atom

Number of atoms of He in

100

u of He (atomic weight of He is

4

) are

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Science>Chemistry>Atoms and Molecules>Atom

0.228 g

of silver salt of dibasic acid gave a residue of

0.162 g

of silver on ignition, then molecular weight of the acid is

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Science>Chemistry>Atoms and Molecules>Atom

Tabulate the difference between gram-molecular mass and relative molecular mass.

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Science>Chemistry>Atoms and Molecules>Atom

An alkane has a

\frac{C}{H}

ratio (by mass) of

5.1428

. Its molecular formula is

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

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Science>Chemistry>Atoms and Molecules>Atom

What will be the mass of one

{}^{12}C

atom in

g

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Science>Chemistry>Atoms and Molecules>Atom

Define: gram-atomic mas.

What is the weight of one atom of H in g ( at.wt. of H = 1.008 )?

Important Questions on Atoms and Molecules

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What is the weight of one atom of H in g ( $a t . w t . o f H = 1.008$ )?