Question

Step by step please



I am asking this question again because I asked for step by step and last time users just helped me by giving final answer without step by step. So please give step by step answer ​

Answer 1

Explanation:-

Word equation

Sodium metal reacts with water to give Sodium Hydroxide and Hydrogen Gas.

Chemical equation

Na + H₂O → NaOH + H₂

Balanced equation

There are many ways to balance a chemical equation. Let us balance the above equation using 'algebraic method'.

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Firstly, let's rewrite the equation using latter variables for coefficients :-

aNa + bH₂O → cNaOH + dH₂

Now we set up a series of equations, one for each element :-

• Na : a = c

• H : 2b = c + 2d

• O : b = c

Let, c = 1

Then, b = 1 ; a = 1, d = ½

Putting values of coefficients, we get :-

= 1Na + 1H₂O → 1NaOH + ½H₂

= 2(Na + H₂O) → 2(NaOH + ½H₂)

= 2Na + 2H₂O → 2NaOH + H₂

Thus the balanced equation is :-

2Na + 2H₂O → 2NaOH + H₂

Answer 2

Word Equation:-

• Sodium metal with water will give rise to Sodium Hydroxide and Hydrogen gas.

Step 1:- Write the given unbalanced equation with correct chemical formulae.

Chemical equation:-

• $\sf Na \: + \: H_2O \: \longrightarrow \: NaOH \: + \: H_2$

Step 2:- Compare the number of atoms of each element on both sides.

Comparison:-

• Element - LHS - RHS

• Na - 1 - 1

• H - 2 - 3

• O - 1 - 1

So, we have to make both LHS and RHS equal of H

Step 3:- Balancing the equation

• $\sf Na \: + \: H_2O \: \longrightarrow \: NaOH \: + \: H_2$

Adding 2 for NaOH,

• $\sf Na \: + \: H_2O \: \longrightarrow \: 2NaOH \: + \: H_2$

Now, Adding 2 for Na

• $\sf 2Na \: + \: H_2O \: \longrightarrow \: 2NaOH \: + \: H_2$

Now, balancing H,

Adding 2 for $\sf H_2O$ ,

• $\sf 2Na \: + \: 2H_2O \: \longrightarrow \: 2NaOH \: + \: H_2$

Now lets check them,

Comparing,

• Element - LHS - RHS

• Na - 2 - 2

• H - 4 - 4

• O - 4 - 4

Step 4:- Reducing the equation to the lowest co-efficients.

• Since, the balanced equation is already at the lowest co-efficients, there is nothing we have to change.

Hence, the chemical equation is balanced.

Therefore,

Balanced equation :-

• $\boxed{\pink{\sf 2Na \: + \: 2H_2O \: \longrightarrow \: 2NaOH \: + \: H_2}}$