If Avogadro number N A , is changed from 6.022 × 10 23 m o l - 1 to 6.022 × 10 20 m o l - 1 , this would change:

The definition of mass in units of grams

The ratio of chemical species to each other in a balanced equation.

The ratio of elements to each other in a compound.

MEDIUM

Earn 100

$7.02 \times 10^{23}$ molecules of $X_{2}$ , a ssubstance consisting of diatomic molecules, has a mass of $296$ grams. Determine the atomic weight (mass of a mole of atoms) of element $X .$

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Important Questions on Stoichiometry

EASY

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

Which symbol replaced the unit of atomic mass, amu?

EASY

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

Calculate:

Mass of 5 gram atoms of calcium.
[Hint: Gram atoms mass: $Ca = 40 g$ ]

MEDIUM

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

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

EASY

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

The number of water molecules is maximum in

EASY

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

Calculate mass of

3.01 \times 10^{24}

atoms of an element having atomic mass

21.13

MEDIUM

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

The amount of sugar

(C_{12} H_{22} O_{11})

required to prepare

2 L

of its

0 .1 M

aqueous solution is:

EASY

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

A and B react to produce C according to the following chemical equation
$2 A + B \to 2 C$

A, B and C are the formulas for three gaseous substances. The vapour densities of A and B are 32 and 16 respectively. Find out the vapour density of C.

MEDIUM

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

A mixture of gases contains

H_{2}

and

O_{2}

gases in the ratio of

1 : 4

(w/w). What is the molar ratio of the two gases in the mixture?

EASY

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

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?

EASY

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

What is gram atomic mass?

EASY

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

If Avogadro number

N_{A}

, is changed from

6.022 \times 10^{23} m o l^{- 1}

6.022 \times 10^{20} m o l^{- 1}

, this would change:

EASY

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

The unit of atomic mass,

amu

is replaced by

u

, here

u

stands for

MEDIUM

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

A compound with molecular mass

180

is acylated with

{CH}_{3} COCl

to get a compound with molecular mass

390

. The number of amino groups presents per molecule of the former compound is

HARD

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

In Carius method of estimation of halogens,

250 mg

of an organic compound gave

141 mg AgBr

. What is the percentage of bromine in the compound (atomic mass of

Ag = 108

and atomic number of

Br = 80

MEDIUM

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

A sample of a hydrate of barium chloride weighing 61 g was heated until all the water of hydration is removed. The dried sample weighed 52 g. The formula of the hydrated salt is: (atomic mass, Ba = 137 amu, Cl = 35.5 amu)

MEDIUM

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

An unknown chlorohydrocarbon has 3.55 % of chlorine. If each molecule of the hydrocarbon has one chlorine atom only; chlorine atoms present in 1 g of chlorohydrocarbon are :(Atomic wt. of

Cl = 35 .5 u;

Avogadro constant

= 6 .023 \times 10^{23} {mol}^{- 1}

)

EASY

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

Suppose the elements

X

and

Y

combine to form two compounds

X Y_{2}

and

X_{3} Y_{2}

. When

0.1 mole

X Y_{2}

weighs

10 g

and

0.05 mole

X_{3} Y_{2}

weighs

9 g

, the atomic weights of

X

and

Y

are

EASY

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

Calculate:

How many gram atoms of sodium is present in $115 g$ sodium?

EASY

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

What will be the mass of one atom of

{}^{12}C

EASY

Chemistry>Physical Chemistry>Stoichiometry>Atomic and Molecular Masses

One mole of dioxygen gas at

STP

is equal to

7.02×1023 molecules of X2, a ssubstance consisting of diatomic molecules, has a mass of 296 grams. Determine the atomic weight (mass of a mole of atoms) of element X.

Important Questions on Stoichiometry

Learn and Prepare for any exam you want !

$7.02 \times 10^{23}$ molecules of $X_{2}$ , a ssubstance consisting of diatomic molecules, has a mass of $296$ grams. Determine the atomic weight (mass of a mole of atoms) of element $X .$