MEDIUM
Earn 100

The number of moles present in 0.36 g of water.

50% studentsanswered this correctly

Important Questions on Atoms and Molecules

EASY

The number of moles in 400 g CaCO3 is _____ moles.

[Hint: Gram atomic masses: Ca=40 g, C=12 g, O=16 g]

MEDIUM

Nitroglycerine is used as an explosive. The equation for the explosive reaction is:

4C3H5(NO3)3 12CO2 + 10H2O + 6N2 + O2       (l)                        (g)            (l)         (g)      (g)

Atomic mass of C = 12, H = 1, N = 14, O = 16)

How many moles does the equation show for gas molecules produced?

 

EASY

Nitroglycerine is used as an explosive. The equation for the explosive reaction is:

4C3H5(NO3)3  12CO2 + 10H2O + 6N2 + O2     (l)                         (g)            (l)            (g)      (g)

(Atomic mass of C = 12, H = 1, N = 14, O = 16)

How many moles does the equation show for nitroglycerine?

 

 

EASY
4 g of NaOH is dissolved in water and the volume is made up to 1L.
(1 mole of NaOH = 40 g)
(a) Calculate the molarity of the resultant solution. 
(b) How will you make 1 M solution of NaOH using the same amount (4 g) of NaOH
MEDIUM

Find how many moles of atoms are there in:

14 g of lithium.

EASY

The balanced chemical equation for the formation of ammonia gas by the reaction between nitrogen gas and hydrogen gas is given.

N2+3H22NH3

Write the ratio between number of moles of reactants and products in the correct order.

MEDIUM

Nitroglycerine is used as an explosive. The equation for the explosive reaction is:

4C3H5(NO3)3 12CO2 + 10H2O + 6N2 +O2

(Atomic mass of C = 12, H = 1, N = 14, O = 16)

How many moles of gas molecules are obtained from 1 mole of nitroglycerine.

MEDIUM

The molecular mass of methane (CH4) is16 u. .

What is the mass of  5×6.022×1023 CH4 molecules?

 

MEDIUM

Find how many moles of atoms are there in:

40 g of calcium.

MEDIUM

Find how many moles of atoms are there in:

7 g of nitrogen.

EASY
Atomic mass of nitrogen is 14 u. Which of the following sample contain 6.022×1023 nitrogen atoms?
MEDIUM

Find how many moles of atoms are there in:

4.6 g of sodium.

EASY

The chemical equation for the manufacture of ammonia is N2(g)+3H2(g)2NH3(g)

Complete the following:

1 mol N2 + ____ H2 ____ NH3

EASY

The balanced chemical equation for the formation of ammonia gas by the reaction between nitrogen gas and hydrogen gas is given.

N2+3H22NH3

How many moles of ammonia are formed when 6 moles of N2 reacts with 6 moles of H2?

EASY

The chemical equation for the manufacture of ammonia is N2(g)+3H2(g)2NH3(g)

Calculate the amount of H2 required to react with 28 g of N2 completely. 
 [Molecular mass of N2= 28 u, H2 = 2 u

EASY

According to the following chemical equation:

2ZnS + 3O2 2ZnO + 2 SO2

from 100 mole of ZnS

(i) how many gram of ZnO, and

(ii) how many mole of SO2, will be produced ? 
(Zn=65.5, S = 32, 0 = 16)

MEDIUM

The molecular mass of methane (CH4) is16 u..

Calculate the number of mole molecules in 160 g of CH4

MEDIUM

Find how many moles of atoms are there in:

32 g of sulphur.

HARD

Calculate the amount of each reactant required to produce 750 ml of carbon dioxide, when two volumes of carbon monoxide combine with one volume of oxygen to produce two volumes of carbon dioxide.

2CO+O22CO2

MEDIUM

Complete the table given below.

Element Atomic mass  Molecular mass  Atomicity number
Chlorine            35.5              71             -
Ozone            -             48            3
Sulphur           32                       -            8
Nitrogen           14            -            2