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jonny [76]
3 years ago
6

A form of phosphorus called red phosphorus is used in match heads. When 0.062 g of red phosphorus burns in air, it forms 0.142 g

of phosphorus oxide. Determine the empirical formula of phosphorus oxide.(show work; use labels)
Chemistry
1 answer:
zmey [24]3 years ago
4 0

Answer: The empirical formula is P_2O_5

Explanation:

Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.

a) If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of P = 0.062 g

Mass of O= (0.142- 0.062) = 0.08 g

Step 1 : convert given masses into moles

Moles of P=\frac{\text{ given mass of P}}{\text{ molar mass of P}}= \frac{0.062g}{31g/mole}=0.002moles

Moles of O=\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{0.08g}{16g/mole}=0.005moles

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For P = \frac{0.002}{0.002}=1

For O =\frac{0.005}{0.002}=2.5

The ratio of P: O = 1: 2.5

Converting them into whole number ratios by multiplying with 2:

Hence the empirical formula is P_2O_5

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Answer:

The correct answer is "True".

Explanation:

A reaction mechanism is a theoretical postulate that tries to explain in a logical way which are the elemental and intermediary reactions that happen in a chemical reaction and that allow to explain the qualitative and quantitative characteristics observed in its development, in which a unique molecular event is described in each elemental step.

Have a nice day!

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Furkat [3]

Answer:

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6 0
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What is the percent of O in CO2
zmey [24]

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5 0
3 years ago
Read 2 more answers
Find the pH of a 0.010 M HNO2 solution.
lidiya [134]
Data:
Molar Mass of HNO2
H = 1*1 = 1 amu
N = 1*14 = 14 amu
O = 3*16 = 48 amu
------------------------
Molar Mass of HNO2 = 1 + 14 + 48 = 63 g/mol

M (molarity) = 0.010 M (Mol/L)


Now, since the Molarity and ionization constant has been supplied, we will find the degree of ionization, let us see:
M (molarity) = 0.010 M (Mol/L)
Use: Ka (ionization constant) = 5.0*10^{-4}
\alpha^2 (degree\:of\:ionization) = ?

Ka = M * \alpha^2
5.0*10^{-4} = 0.010* \alpha^2
0.010\alpha^2 = 5.0*10^{-4}
\alpha^2 = \frac{5.0*10^{-4}}{0.010}
\alpha^2\approx500*10^{-4}

\alpha\approx\sqrt{500*10^{-4}}
\alpha \approx 2.23*10^{-3}

Now, we will calculate the amount of Hydronium [H3O+] in nitrous acid (HNO2), multiply the acid molarity by the degree of ionization, we will have:

[ H_{3} O^+] = M* \alpha
[ H_{3} O^+] = 0.010* 2.23*10^{-3}
[ H_{3} O^+] \approx 0.0223*10^{-3}
[ H_{3} O^+] \approx 2.23*10^{-5} \:mol/L

And finally, we will use the data found and put in the logarithmic equation of the PH, thus:

Data:
log10(2.23) ≈ 0.34
pH = ?
[ H_{3} O^+] = 2.23*10^{-5}

Formula:
pH = - log[H_{3} O^+]

Solving:
pH = - log[H_{3} O^+]
pH = -log2.23*10^{-5}
pH = 5 - log2.23
pH = 5 - 0.34
\boxed{\boxed{pH = 4.66}}\end{array}}\qquad\quad\checkmark

Note:. The pH <7, then we have an acidic solution.
6 0
3 years ago
In which of the following substances does sharing of electrons between two atoms occur?
malfutka [58]

Answer:- B- SO_4^-^2

Explanations:- Sharing of electrons takes place between non metals and the bond formed by the sharing of electrons is known as covalent bond. In first choice we only have a zinc metal and so no sharing of electrons  would be possible here.

In third choice we have NaCl. Na is a metal and Cl is a non metal. The property of metals is to transfer its valence electrons to the non metal and the bond formed is known as ionic bond. So, third choice is also not correct.

In choice B we have sulfate ion that has sulfur and oxygen atoms and both of these are non metals. So, sharing of electrons is present here between the S and O atoms and covalent bonds are formed.

So, choice B- SO_4^-^2 is the right answer.


6 0
3 years ago
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