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2 years ago

8

What is the difference between a conductor and an insulator?

1 answer:

Zielflug [23.3K]2 years ago

5 0

A conductor is what helps heat or electricity pass through an object. Examples of conductors are, silver, iron, aluminum, etc..

An insulator does the opposite and instead, stops either from going through. Examples of an insulator is paper, wood, rubber, etc.

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How many moles of lithium metal would need to react with excess oxygen gas to produce 4 moles of lithium oxide in the following

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8 moles of Lithium are needed.

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3 years ago

Which group of elements are the most important for living organisms?\

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3 years ago

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How many grams of sodium formate, NaCHO2, would have to be dissolved in 3.0 L of 0.12 M formic acid (pKa 3.74) to make the solut

kolbaska11 [484]

Answer:

$Mass_{sodium\ formate}= 889.57\ g$

Explanation:

Considering the Henderson- Hasselbalch equation for the calculation of the pH of the acidic buffer solution as:

$pH=pK_a+log\frac{[salt]}{[acid]}$

Given that:-

[Acid] = 0.12 M

Volume = 3.0 L

pKa = 3.74

pH = 5.30

So,

$5.30=3.74+log\frac{[sodium\ formate]}{0.12}$

Solving, we get that:-

[Sodium formate] = 4.36 M

Considering:

$Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}$

So,

$Moles =Molarity \times {Volume\ of\ the\ solution}$

So, Moles of sodium formate = 4.36*3.0 moles = 13.08 moles

Molar mass of sodium formate = 68.01 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$13.08\ mole= \frac{Mass}{68.01\ g/mol}$

$Mass_{sodium\ formate}= 889.57\ g$

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4 years ago

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Answer:

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Explanation:

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Hiram Revels was the first black man to be elected to the US senate

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3 years ago

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