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3 years ago

How many atoms of carbon are present in 10 grams of coke?

Chemistry

1 answer:

Alekssandra [29.7K]3 years ago

7 0

Answer:

5.0*10^23 atoms

Explanation:

1 mole c atoms=12g=6.02*10^23 atoms

12g c contain 6.02*10^23 atoms

10g c contain = (6.02 *10^23 atoms ÷ 12g)*10g

5.0*10^23 atoms

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A gas mixture contains 1.52 atm of Ne, 766 mmHg of He and Ar. What is the partial pressure, in atmospheres, of At if the gas mix

ValentinkaMS [17]

Answer:

0.74 atm.

Explanation:

From the question given above, the following data were obtained:

Pressure of Ne (Pₙₑ) = 1.52 atm

Pressure of He (Pₕₑ) = 766 mmHg

Total pressure (Pₜ) = 3.27 atm

Pressure of Ar (Pₐᵣ) =?

Next, we shall convert the pressure of He from mmHg to atm. This can be obtained as follow:

760 mmHg = 1 atm

Therefore,

766 mmHg = 766 mmHg × 1 atm / 760 mmHg

766 mmHg = 1.01 atm

Finally, we shall determine the partial pressure of Ar. This can be obtained as follow:

Pressure of Ne (Pₙₑ) = 1.52 atm

Pressure of He (Pₕₑ) = 1.01 atm

Total pressure (Pₜ) = 3.27 atm

Pressure of Ar (Pₐᵣ) =?

Pₜ = Pₙₑ + Pₕₑ + Pₐᵣ

3.27 = 1.52 + 1.01 + Pₐᵣ

3.27 = 2.53 + Pₐᵣ

Collect like terms

3.27 – 2.53 = Pₐᵣ

Pₐᵣ = 0.74 atm

Thus the partial pressure of Ar is 0.74 atm.

8 0

3 years ago

The phophorus pentoxide used to produce phosphoric acid for cola soft drinks is prepared by nurning phosphorus in oxygen.

Radda [10]

Answer : The percent yield of $P_4O_{10}$ is, 87.7 %

Solution : Given,

Moles of $P_4$ = 0.200 mole

Moles of $O_2$ = 0.200 mole

Molar mass of $P_4O_{10}$ = 283.9 g/mole

First we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

$P_4+5O_2\rightarrow P_4O_{10}$

From the balanced reaction we conclude that

As, 5 mole of $O_2$ react with 1 mole of $P_4$

So, 0.200 moles of $O_2$ react with $\frac{0.200}{5}=0.04$ moles of $P_4$

From this we conclude that, $P_4$ is an excess reagent because the given moles are greater than the required moles and $O_2$ is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of $P_4O_{10}$

From the reaction, we conclude that

As, 5 mole of $O_2$ react to give 1 mole of $P_4O_{10}$

So, 0.200 moles of $O_2$ react to give $\frac{0.200}{5}=0.04$ moles of $P_4O_{10}$

Now we have to calculate the mass of $P_4O_{10}$

$\text{ Mass of }P_4O_{10}=\text{ Moles of }P_4O_{10}\times \text{ Molar mass of }P_4O_{10}$

$\text{ Mass of }P_4O_{10}=(0.04moles)\times (283.9g/mole)=11.4g$

Theoretical yield of $P_4O_{10}$ = 11.4 g

Experimental yield of $P_4O_{10}$ = 10.0 g

Now we have to calculate the percent yield of $P_4O_{10}$

$\% \text{ yield of }P_4O_{10}=\frac{\text{ Experimental yield of }P_4O_{10}}{\text{ Theretical yield of }P_4O_{10}}\times 100$

$\% \text{ yield of }P_4O_{10}=\frac{10.0g}{11.4g}\times 100=87.7\%$

Therefore, the percent yield of $P_4O_{10}$ is, 87.7 %

5 0

3 years ago

Describe how is the atomic mass of an atom is calculated. URGENT, NEED TO KNOW NOW!!!

padilas [110]

If it's your first encounter with chemistry, your instructor will want you to learn how to use the periodic table to find the atomic mass (atomic weight) of an element. This number usually is given below an element's symbol. Look for the decimal number, which is a weighted average of the atomic masses of all the natural isotopes of an element.

8 0

3 years ago

How many protons neutrons and electrons are there in a neutral atom of 43k (potassium-43)?

Veronika [31]

Answer:

Number of Protons = 19

Number of Neutrons = 25

Number of Electrons = 19

Explanation:

Number of Protons:

The number of protons present in any atom are equal to the atomic number of that particular atom. Hence, as the atomic number of Potassium is 19 therefore, it contains 19 protons.

Number Neutrons:

The number of neutrons present in atom are calculated as,

# of Neutrons = Atomic Mass - # of protons

As given,

Atomic Mass = 43

# of Protons = 19

So,

# of Neutrons = 43 - 19

# of Neutrons = 24

Number of Electrons:

As we know for a neutral atom the number of electrons are exactly equal to the number of protons present in its nucleus. So, for 19 protons in neutral Potassium atom there must be 19 electrons.

3 0

3 years ago

D Which compound is insoluble in water?

densk [106]

Answer:

Examples of substances insoluble in water: oil, acetone, ether

Explanation:

Such examples of substances are non-polar and do not dissolve in water (polar compound). The classic example is oil floating in water (this happens because oil has a lower density than water).

3 0

4 years ago