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 hydrogen and 3.47 g of sodium hydroxide, what mass of water was involved in the reaction?

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

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.

answer: option (4) is the correct answer.

explanation:

areas which are at low altitudes and near the equator tend to receive direct sunlight from the sun. hence, heat energy or radiations from the sun make these areas warmer and they have warmest water.

whereas areas which are at high altitudes and away from the equator do no receive direct sunlight. hence, no direct contact from the sun makes these regions colder and thus, they have colder water.

thus, we can conclude that the statement areas at low latitudes near the equator have the warmest water because they receive the most direct sunlight best explains the relationship between an area's geography and the temperature of its surface water.

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