Long answer questions II — task. Science State Board, Class 10.

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1. $N_2+3H_2→2NH_3$

(The atomic mass of nitrogen is $14$ , and that of hydrogen is $1$ )

$1$ mole of nitrogen (_______g) +

$3$ moles of hydrogen ( _________ g) →

$2$ moles of ammonia ( _________ g)

The formula to find mass of an element from mole is,

$\text{Mass of element}$

$=$

$\ (\text {X} )\ \cdot\ (\text {Atomic mass of the element} )$

Where,

X is

Y is

Therefore,

$1$

$mole$ of nitrogen (

$N_2$ ):

$1$

$mole$ of nitrogen (

$N_2$ )

$=$

$3$

$moles$ of hydrogen (

$H_2$ ):

$3$

$moles$ of hydrogen (

$H_2$ )

$=$

$2$

$moles$ of ammonia (

$NH_3$ ):

$2$

$moles$ of ammonia (

$NH_3$ )

$=$

2. Give the salient features of “Modern atomic theory”.

Atomic can differ amongst atoms of the .
Atoms of different elements may have the .
Atoms of one element can be transmuted into atoms of other elements. In other words, an atom is no longer indestructible.
Atoms may not always combine in a simple whole-number ratio.
The atom is the smallest particle involved in a chemical reaction.
The mass of an atom can be converted into . [].

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11. Long answer questions II