Question

Read that From picture and tell me the answer please​

Answer 1

1g Hydrogen

Step-by-step explanation:

Getting to the equation:

Calcium in water reacts vigorously to give a cloudy white Precipitate (compound) called Calcium hydroxide alongwith the evolution of Hydrogen gas.

`\boxed{ \mathsf{Ca + H_2O \rightarrow Ca(OH)_2 + H_2}}`

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Balancing the equation:

This reaction is not in it's balanced form! The number of atoms of Hydrogen on the left is 2 while that on the right is 4,I.e.,they're not equal.

Adding a 2 in front of H2O solves the problem by making the number of atoms of each element on both the sides equal.

`\mathsf{Ca +2 H_2O \rightarrow Ca(OH)_2 + H_2}`

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Observations:

Looking into the equation more carefully, we see:

1 atom of Calcium reacts with 2 molecules of water to give 1 molecule of Calcium Hydroxide alongwith 1 molecule of Hydrogen gas.

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Gram atomic and molecular masses

Mass of one atom of Calcium = it's gram atomic mass

= 40 g

Mass of one "molecule" of Hydrogen

= it's Gram molecular mass

= gram mass of one atom × number of atoms in one molecule

= 1 × 2

= 2 g

So,

according to our observation:

One atoms of Calcium gives one molecule of Hydrogen (during the particular reaction)

=> 40g of Calcium gives = 2g of Hydrogen

•°• 1 g of Calcium gives =
`(2)/(40)`

=
`(1)/(20)` g Hydrogen

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Answer:

We're provided with 20g of Calcium,

=> 20g of Calcium gives = 20 ×
`(1)/(20)` g H2

= 1 g H2

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Hope this helps!