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3 years ago

A piece of sodium metal undergoes complete reaction

Chemistry

1 answer:

Salsk061 [2.6K]3 years ago

4 0

Answer:

(a) Equation of reaction:

2Na + 2H20 = 2NaOH + H2

(b) 0.46g of sodium was used in the reaction

Explanation:

(a) 2 moles of sodium reacted with 2 moles of water to yield 2 moles of sodium hydroxide and 1 mole of hydrogen gas

(b) mass of hydrogen gas produced (m) = PVM/RT

P = 101.3kpa = 1atm, V = 246mL = 246cm^3, M = 2g/mol, R = 82.057cm^3.atm/gmol.K, T = 25°C = 25+273 = 298K

m = (1×246×2)/(82.057×298) = 0.02g of hydrogen gas

From the equation of reaction

2 moles (46g) of sodium produced 1 mole (2g) of hydrogen gas

0.02g of hydrogen gas was produced by (46×0.02)/2 = 0.46g of sodium

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In the reaction, Zn(s) + 2 HCl(aq) --> ZnCl2 (aq)+ H2(g), 25 grams of Zn are reacted with 17.5 g of HCl. How many grams of H2

Gennadij [26K]

Answer:

0.480 g of H₂ are produced, in the reaction.

Explanation:

This is the reaction:

Zn(s) + 2HCl → ZnCl₂ (aq) + H₂ (g)

We havethe mass of both reactants, so we must work with them to find out the limiting reactant and then, determine the amount of H₂ produced.

Let's convert the mass to moles ( mass / molar mass)

25 g / 65.41 g/mol = 0.382 moles Zn

17.5 g / 36.45 g/mol = 0.480 moles HCl

Ratio is 1:2, so 1 mol of Zn react with the double of moles of HCl.

0.382 moles of Zn would need the double of moles to react, so (0.382 .2) = 0.764 moles of HCl. → We only have 0.480 moles, so the acid is the limiting.

Now let's determine the moles of H₂ formed.

Ratio is 2:1, so If i take account the moles I have, I will produce the half of moles of my product.

0.480 moles / 2 = 0.240 moles of H₂ are produced.

To find out the mass, we must multiply mol . molar mass

0.240 mol . 2g/mol = 0.480 g

3 0

3 years ago

Which models of the atom from task 1 are not supported by Rutherford’s experimental evidence? For each of these models, explain

dolphi86 [110]

Answer:

Which models of the atom from task 1 are not supported by Rutherford’s experimental evidence? For each of these models, explain the experimental results that the model would predict.

where is the model

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3 years ago

True or False

Darina [25.2K]

The answer would be true

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3 years ago

Give the chemical symbol of an element in the third period (row) of the periodic table with four 3p electrons.

Ann [662]

<u>Answer: </u>The chemical symbol of the element is Sulfur.

<u>Explanation:</u>

The element which is present in third period of the periodic table having four 3p electrons is Sulfur. Sulfur is the 16th element of the periodic table which has 6 valance electrons.

The electronic configuration of this element is: $[Ne]3s^23p^4$

This element is considered as a non-metal because it will accept electrons in order to attain stable electronic configuration.

Hence, the chemical symbol of the element is Sulfur.

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Which property of physical changes explains why matter is conserved in a physical change? The arrangements of particles do not c

Galina-37 [17]

Mass is the amount of matter in an object, and weight is the downward pull on an object due to gravity. Which property of physical changes explains why matter is conserved in a physical change? The bonds between atoms do not break; it is only the arrangement that changes.

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3 years ago