(D) Molar mass of $N$ atom $=$ Atomic mass of $N = 14\, g/mol$.Mass of $1$ mole of $N$ atoms $= 1 \times 14 = 14\, g$.$(b)$ Molar mass of $Al$ atom $=

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$14\, g$,$108\, g$ and $1260\, g$

(D) Molar mass of $N$ atom $=$ Atomic mass of $N = 14\, g/mol$.Mass of $1$ mole of $N$ atoms $= 1 \times 14 = 14\, g$.$(b)$ Molar mass of $Al$ atom $= 27\, g/mol$.Mass of $4$ moles of $Al$ atoms $= 4 \times 27 = 108\, g$.$(c)$ Molar mass of $Na_2SO_3 = (23 \times 2) + 32 + (16 \times 3) = 46 + 32 + 48 = 126\, g/mol$.Mass of $10$ moles of $Na_2SO_3 = 10 \times 126 = 1260\, g$.

Class 9 Science ATOMS AND MOLECULES Molecular Mass

Medium

What is the mass of:
$(a)$ $1$ mole of nitrogen atoms?
$(b)$ $4$ moles of aluminium atoms (Atomic mass of aluminium $= 27$)?
$(c)$ $10$ moles of sodium sulphite $(Na_2SO_3)$?

A
$14\, g$,$108\, g$ and $256\, g$
B
$140\, g$,$18\, g$ and $1260\, g$
C
$14\, g$,$90\, g$ and $126\, g$
D
$14\, g$,$108\, g$ and $1260\, g$

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ATOMS AND MOLECULES

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Molecular Mass

Cinnabar $(HgS)$ is a prominent ore of mercury. How many grams of mercury are present in $225 \,g$ of pure $HgS$ (in $,g$)? Molar mass of $Hg$ and $S$ are $200.6 \,g \,mol^{-1}$ and $32 \,g \,mol^{-1}$ respectively.

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$(a)$ Define the following:
$(i)$ Mole
$(ii)$ Gram atomic mass
$(iii)$ Gram molecular mass
$(b)$ Calculate the mass of the following:
$(i)$ $2$ moles of carbon dioxide
$(ii)$ $6.022 \times 10^{23}$ molecules of carbon dioxide.

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What is the fraction of the mass of water due to neutrons?

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Calculate the number of aluminium ions present in $0.051 \, g$ of aluminium oxide.
[Hint: The mass of an ion is the same as that of an atom of the same element. Atomic mass of $Al = 27 \, u$.]

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Which of the following has the maximum number of atoms?

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What is the mass of:$(a)$ $1$ mole of nitrogen atoms?$(b)$ $4$ moles of aluminium atoms (Atomic mass of aluminium $= 27$)?$(c)$ $10$ moles of sodium sulphite $(Na_2SO_3)$?

Similar Questions

Cinnabar $(HgS)$ is a prominent ore of mercury. How many grams of mercury are present in $225 \,g$ of pure $HgS$ (in $,g$)? Molar mass of $Hg$ and $S$ are $200.6 \,g \,mol^{-1}$ and $32 \,g \,mol^{-1}$ respectively.

$(a)$ Define the following:$(i)$ Mole$(ii)$ Gram atomic mass$(iii)$ Gram molecular mass$(b)$ Calculate the mass of the following:$(i)$ $2$ moles of carbon dioxide$(ii)$ $6.022 \times 10^{23}$ molecules of carbon dioxide.

What is the fraction of the mass of water due to neutrons?

Calculate the number of aluminium ions present in $0.051 \, g$ of aluminium oxide.[Hint: The mass of an ion is the same as that of an atom of the same element. Atomic mass of $Al = 27 \, u$.]

Which of the following has the maximum number of atoms?

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What is the mass of:
$(a)$ $1$ mole of nitrogen atoms?
$(b)$ $4$ moles of aluminium atoms (Atomic mass of aluminium $= 27$)?
$(c)$ $10$ moles of sodium sulphite $(Na_2SO_3)$?

$(a)$ Define the following:
$(i)$ Mole
$(ii)$ Gram atomic mass
$(iii)$ Gram molecular mass
$(b)$ Calculate the mass of the following:
$(i)$ $2$ moles of carbon dioxide
$(ii)$ $6.022 \times 10^{23}$ molecules of carbon dioxide.

Calculate the number of aluminium ions present in $0.051 \, g$ of aluminium oxide.
[Hint: The mass of an ion is the same as that of an atom of the same element. Atomic mass of $Al = 27 \, u$.]