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Vesnalui [34]
3 years ago
11

Cortisone consists of molecules, each of which contains 21 atoms of carbon (plus other atoms). the mass percentage of carbon in

cortisone is 69.98%. what is the molar mass of cortisone?
Chemistry
1 answer:
GalinKa [24]3 years ago
4 0

Now to solve this problem, we are given the number of atoms therefore we must first convert this into number of moles. We can do this by using the Avogadro’s number. Calculating for number of moles of Carbon:

number of moles Carbon = 21 atoms of carbon (1 mole / 6.022 x 10^23 atoms C)

number of moles Carbon = 3.49 x 10^-23 mol C

 

Converting this to mass by multiplying the molar mass of C:

mass Carbon = 3.49 x 10^-23 mol C (12 g / mol)

mass Carbon = 4.18 x 10^-22 g

 

Therefore the mass of one molecule of Cortisone is:

mass of 1 molecule Cortisone = 4.18 x 10^-22 g / 0.6998

mass of 1 molecule Cortisone = 5.98 x 10^-22 g per molecule

 

Converting this to mass per 1 mol of Cortisone, by using again the Avogadro’s number:

mass of 1 mol Cortisone = (5.98 x 10^-22 g / molecule) (<span>6.022 x 10^23  molecules / mol)</span>

mass of 1 mol Cortisone = 360.10 g / mol = molar mass of cortisone

 

Answer:

360.10 g / mol

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UNO [17]

Answer:

Fe (s) + Sn^{2+} (aq)\rightarrow Fe^{2+} (aq) + Sn (s)

Explanation:

Although the context is not clear, let's look at the oxidation and reduction processes that will take place in a Fe/Sn system.

The problem states that anode is a bar of thin. Anode is where the process of oxidation takes place. According to the abbreviation 'OILRIG', oxidation is loss, reduction is gain. Since oxidation occurs at anode, this is where loss of electrons takes place. That said, tin loses electrons to become tin cation:

Sn (s)\rightarrow Sn^{2+} (aq) + 2e^-

Similarly, iron is cathode. Cathode is where reduction takes place. Reduction is gain of electrons, this means iron cations gain electrons and produce iron metal:

Fe^{2+} (aq) + 2e^-\rightarrow Fe (s)

The net equation is then:

Sn (s) + Fe^{2+} (aq)\rightarrow Fe (s) + Sn^{2+} (aq)

However, this is not the case, as this is not a spontaneous reaction, as iron metal is more reactive than tin metal, and this is how the coating takes place. This implies that actually anode is iron and cathode is tin:

Actual anode half-equation:

Fe (s)\rightarrow Fe^{2+} (aq) + 2e^-

Actual cathode half-equation:

Sn^{2+} (aq) + 2e^-\rightarrow Sn (s)

Actual net reaction:

Fe (s) + Sn^{2+} (aq)\rightarrow Fe^{2+} (aq) + Sn (s)

6 0
3 years ago
Which property does a metal with a large number of free-flowing electrons most likely have?
Akimi4 [234]

a metal with a large number of free-flowing electrons most likely have good conductivity

6 0
3 years ago
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How many reactant molecules and product gas molecules are in this equation?
Mice21 [21]

Answer:

N₂  = 6.022 × 10²³ molecules

H₂ = 18.066 × 10²³ molecules

NH₃ = 12.044 × 10²³ molecules

Explanation:

Chemical equation;

N₂ + 3H₂     →  2NH₃

It can be seen that there are one mole of nitrogen three mole of hydrogen and two moles of ammonia are present in this equation. The number of molecules of reactant and product would be calculated by using Avogadro number.

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

Number of molecules of nitrogen gas:

1 mol = 6.022 × 10²³ molecules

Number of molecules of hydrogen:

3 mol × 6.022 × 10²³ molecules/ 1 mol

18.066 × 10²³ molecules

Number of molecules of ammonia:

2 mol × 6.022 × 10²³ molecules/ 1 mol

12.044 × 10²³ molecules

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Your question: What form of waste cannot be recycled to make new products..?

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Happy Studying! =)


4 0
3 years ago
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