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Atomic Mass and Atomic Mass Unit

Which of the ...

Question

Which of the following contains maximum number of molecules?

A

4

gm of hydrogen

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B

22.4

L of oxygen at S.T.P.

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C

C O_{2}

obtained by heating

1

mole of calcium carbonate

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D

4

g of helium

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Solution

The correct option is A $4$ gm of hydrogen
Number of molecules = Number of moles $\times N_{A}$

Hence, the more the number of moles the more is the number of molecules.

$4$ g of hydrogen corresponds to $\frac{4}{1} = 4$ moles of it, whereas $4$ g He corresponds to $\frac{4}{4} = 1$ mole of it.

$22.4$ L oxygen at STP corresponds to $\frac{22.4}{22.4} = 1$ mole.

$1$ mole carbon dioxide is obtained by heating $1$ mole of calcium carbonate.
$C a C O_{3} ⟶ C a O + C O_{2}$

Hence the number of molecules is maximum in option A.

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Similar questions

22.4

L of ethane at S.T.P contains one mole of hydrogen molecules. Reason: One mole of hydrogen molecules at S.T.P occupies 22.4 L volume.

Choose the correct options.

Q. Calcium carbonate decomposes on heating according to the following equation.

C a C O_{3} (s) ⇌ C a O (s) + C O_{2} (g)

How many moles of

C O_{2}

will be obtained by decomposition of 50 g

C a C O_{3}

Q. The volume of

C O_{2}

obtained at STP by the decompostion of 10 g of calcium carbonate is:
(molar mass of calcium carbonate = 100

g m o l^{- 1}

Q. Fill in the following blanks :
(a) 1 mole contains ...................... atoms, molecules or ions of a substance.
(b) A mole represents an ..................... number of particles of a substance.
(c) 60 g of carbon element are ................... moles of carbon atoms.
(d) 0.5 mole of calcium element has a mass of ......................
(e) 64 g of oxygen gas contains ....................... moles of oxygen atoms.

Q. Identify the true statements among the following.
(A) 4 g of helium and 2 g of hydrogen contain the same number of molecules.
(B) If 1.1 g of a gas occupied a 560 m

l

of volume, its vapour density is 22.
(C) Both 1 mole of sulphuric acid 1 mole of ammonium hydroxide contains the same number of hydrogen atoms.
(D) 48 g of oxygen and ozone occupy same volume under similar conditions.

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