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Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas

zzz [600]

2Na + 2H2O ----> H2 + 2Na(OH)

48.7/23 = 2.12 moles sodium
2.12/2 x 24 = 25.44dm^3 hydrogen = 1.06 moles

1.06 X 6.02x10^23 = 1.204x10^24 molecules of hydrogen

8 0

3 years ago

Aqueous hydrochloric acid HCl reacts with solid sodium hydroxide NaOH to produce aqueous sodium chloride NaCl and liquid water H

allochka39001 [22]

Answer : The theoretical yield of water formed from the reaction is 0.54 grams.

Solution : Given,

Mass of HCl = 1.1 g

Mass of NaOH = 2.1 g

Molar mass of HCl = 36.5 g/mole

Molar mass of NaOH = 40 g/mole

Molar mass of $H_2O$ = 18 g/mole

First we have to calculate the moles of HCl and NaOH.

$\text{ Moles of }HCl=\frac{\text{ Mass of }HCl}{\text{ Molar mass of }HCl}=\frac{1.1g}{36.5g/mole}=0.030moles$

$\text{ Moles of }NaOH=\frac{\text{ Mass of }NaOH}{\text{ Molar mass of }NaOH}=\frac{2.1g}{40g/mole}=0.525moles$

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

$HCl+NaOH\rightarrow NaCl+H_2O$

From the balanced reaction we conclude that

As, 1 mole of HCl react with 1 mole of NaOH

So, 0.030 mole of HCl react with 0.030 mole of NaOH

From this we conclude that, $NaOH$ is an excess reagent because the given moles are greater than the required moles and $HCl$ is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of $H_2O$

From the reaction, we conclude that

As, 1 mole of $HCl$ react to give 1 mole of $H_2O$

So, 0.030 moles of $HCl$ react to give 0.030 moles of $H_2O$

Now we have to calculate the mass of $H_2O$

$\text{ Mass of }H_2O=\text{ Moles of }H_2O\times \text{ Molar mass of }H_2O$

$\text{ Mass of }H_2O=(0.030moles)\times (18g/mole)=0.54g$

Therefore, the theoretical yield of water formed from the reaction is 0.54 grams.

6 0

3 years ago

The diameter of a carbon atom is approximately 144 pm. Assuming a nanocontainer has a simple cubic structure and have an edge le

ivann1987 [24]

To answer this question, you need to understand the naming of meter unit system. The unit pm stands for pico meter which was 1/1000 of nanometer. Then, the calculation would be:

Number of atom= container length / atom diameter
Number of atom = 25 nm x (1000pm/nm) / 144pm= 173.6 atom

5 0

3 years ago

Select the correct answer.

elena-s [515]

Answer:

B. CO + H₂O → H₂ + CO₂

Explanation:

Redox reaction -

It is the type of reaction , where the process of oxidation and reduction takes place simultaneously , is known as a redox reaction .

Oxidation refers to the addition of oxygen atom or the removal of hydrogen atom .

And ,

Reduction refers to the addition of hydrogen atom or the removal of the oxygen atom .

From the options given in the question , the only reaction , which have both the process of oxidation as well as reduction , is -

CO + H₂O → H₂ + CO₂

In the above reaction ,

Oxidation process - CO → CO₂ ,

The addition of oxygen atom .

Reduction process - H₂O → H₂ ,

The removal of oxygen atom .

5 0

3 years ago

How does Silicon shape our technological reality

Vladimir79 [104]

Silicons are used in our day to day technology products.It is used used to micro-chips and motherboards and other components on nano-technologies.

3 0

3 years ago