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2 years ago

I will give thanks, profile thanks, brainliest and 5 star

Chemistry

2 answers:

liubo4ka [24]2 years ago

4 0

Answer: E.) C2N2H8

Explanation:

Alchen [17]2 years ago

3 0

Answer:

E ) C2N2H8

Explanation:

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Use the Henderson-Hasselbalch equation, eq. (3), to calculate the pH expected for a buffer solution prepared from this acid and

notka56 [123]

Answer:

$pH=4.56$

Explanation:

Hello there!

In this case, given the Henderson-Hasselbach equation, it is possible for us to compute the pH by firstly computing the concentration of the acid and the conjugate base; for this purpose we assume that the volume of the total solution is 0.025 L and the molar mass of the sodium base is 234 - 1 + 23 = 256 g/mol as one H is replaced by the Na:

$n_{acid}=\frac{0.2g}{234g/mol}=0.000855mol\\\\n_{base}= \frac{0.2g}{256g/mol}=0.000781mol$

And the concentrations are:

$[acid]=0.000855mol/0.025L=0.0342M$

$[base]=0.000781mol/0.025L=0.0312M$

Then, considering that the Ka of this acid is 2.5x10⁻⁵, we obtain for the pH:

$pH=-log(2.5x10^{-5})+log(\frac{0.0312M}{0.0342M} )\\\\pH=4.60-0.04\\\\pH=4.56$

Best regards!

6 0

2 years ago

Explain the difference between fixed and variable oxidation

dem82 [27]

Fixed vs Variable Oxidation is given below.

Explanation:

1.In its compounds, hydrogen has an oxidation number of +1, except. hydrides where the. oxidation number of hydrogen is -1. In their compounds, the metals with fixed oxidation states have the oxidation number that. corresponds with the fixed oxidation number.

A variable oxidation state is a value that determines the charge of the atom depending on certain conditions.

2. Oxidation state of elements is considered to be of the most important in the study of chemistry. For some elements, this figure is constant known as fixed oxidation , while for others it is variable is called variable oxidation state.

3. MgCl2 : magnesium is in Group IIA and all elements in Group IIA have fixed oxidation numbers of +2

FeCl2 : iron has a variable oxidation number of either +2 or +3 and is not fixed

7 0

3 years ago

The Periodic Table of the Elements organizes elements according to their properties. A section of the periodic table is shown. W

horrorfan [7]

You haven't attached any options but anyways, to help you with your question, elements belonging to the same group (e.g. alkali metals, noble gases) all have the same chemical properties. Hydrogen, for example, have the same properties with Sodium, Potassium and Lithium.

3 0

3 years ago

Solid carbon reacts with oxygen gas to form carbon dioxide gas . Write a balanced chemical equation for this reaction

Nikitich [7]

Solid carbon reacts with oxygen gas to form carbon dioxide gas.

The balanced chemical equation for this reaction:

$C (s) + O_{2}(g) ---> CO_{2}(g)$

7 0

3 years ago

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What is produced when an acid reacts with a base?

Lelu [443]

Answer:

salt and water

Explanation:

they react to neutralize the acid and base properties,producing a salt while the H(+) cation of the acid combines with OH(-) anion of the base to form water. I hope it's helpful

4 0

3 years ago

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