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stepan [7]
3 years ago
12

Sodium metal and water react to form hydrogen and sodium hydroxide. If 1.99 g of sodium react with water to form 0.087 g of hydr

ogen and 3.47 g of sodium hydroxide, what mass of water was involved in the reaction?
Chemistry
2 answers:
zavuch27 [327]3 years ago
7 0

Answer:

1.56 g of water was involved in the reaction

Explanation:

From the stoichiometric equation

2Na + 2H2O = 2NaOH + H2

NB : Mm Na= 23, Mm H2O = ( 2+16)= 18

2(23) of Na requires 2(18) of water

Hence 1.99g of Na will require 1.99×2×18/2(23) of water = 1.56 g of water

zavuch27 [327]3 years ago
7 0

Answer:

1.6 g.

Explanation:

On of the laboratory process for the preparation of Hydrogen is the reaction of sodium with water. The balanced equation for the reaction is given below;

2Na(s) + 2H2O(g) -----------------------> 2NaOH(aq) + H2(g).

From the equation of reaction above we have 2 moles of Na reacting with 2 moles of water to give 2 moles of sodium Hydroxide, NaOH and one mole of Hydrogen.

That is;

2 : 2 ---------> 2 : 1.

So, the molar mass of NaOH = 40 grams per mole.

And from the question we are given the following parameters; mass of NaOH = 3.47 g, mass of Hydrogen formed= 0.087 g , mass of Sodium, Na = 1.99 g.

Hence, the mass of water involved in the reaction =[ (2 × 18) / 80 ] × 3.47 grams.

mass of water involved in the reaction = 0.45 × 3.47 grams.

mass of water involved in the reaction = 1.5615 g.

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Next, let us obtain the masses of Al(OH)3 and HCl that reacted together according to the equation. This can be achieved as shown below:

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From the equation above,

78g of Al(OH)3 reacted with 109.5g of HCl.

Therefore, 0.5g of Al(OH)3 will react with = (0.5 x 109.5)/78 = 0.7g of HCl

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