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Snezhnost [94]
3 years ago
14

Balance the equation. Mg3(PO4)2+? C → ? Mg3P2+? CO , using the smallest possible integers. What is the sum of the coefficients i

n the balanced equation?1. 14.
2. 16.
3. 12.
4. 18.
5. 22.
Chemistry
1 answer:
Nuetrik [128]3 years ago
8 0

Answer:

Sum of coefficients in balanced equation is 18

Explanation:

Unbalanced equation: Mg_{3}(PO_{4})_{2}+C\rightarrow Mg_{3}P_{2}+CO

Balance O: Mg_{3}(PO_{4})_{2}+C\rightarrow Mg_{3}P_{2}+8CO

Balance C: Mg_{3}(PO_{4})_{2}+8C\rightarrow Mg_{3}P_{2}+8CO

Balanced equation:Mg_{3}(PO_{4})_{2}+8C\rightarrow Mg_{3}P_{2}+8CO

Sum of coefficients in balanced equation = (1+8+1+8) = 18

So, option (4) is correct.

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What is the mass of 2.23 × 10^23 atoms of aluminum?​
rjkz [21]

Answer:

10

Explanation:

In image

Take atomic mass or molar mass

of Al =27

7 0
3 years ago
Given the following partial (valence-level) electron configurations,<br> (a) identify each element,
Kamila [148]

The arrangement of electrons within an atom is called the electronic configuration and the electrons are filled up according to the energy of the levels as: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f.

<h3>What is the difference between electron configuration and valence electron configuration?</h3>

Electron configuration is the number of electrons that are present in the atom and is repressed through the different sub-shells. So for example, the electron configuration for oxygen is 1s^2 2s^2 2p^4. While the valence electrons only refer to the electrons in the outermost shell of the atom.

<h3>What is a partial orbital diagram?</h3>

A partial orbital diagram shows only the highest energy sublevels being filled. Al (Z = 13) 1s22s22p63s23p1. A condensed electron configuration has the element symbol of the previous noble gas in square brackets. Al has the condensed configuration [Ne]3s23p1.

Learn more about electronic configuration here:

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4 0
2 years ago
Lead(II) nitrate and ammonium iodide react to form lead(II) iodide and ammonium nitrate according to the reaction Pb ( NO 3 ) 2
nikklg [1K]

Answer : The volume of NH_4I solution required is, 2.93 L

The number of moles of PbI_2 formed from the reaction is, 0.662 moles.

Explanation :

First we have to calculate the initial moles of Pb(NO_3)_2.

\text{Moles of }Pb(NO_3)_2=\text{Concentration of }Pb(NO_3)_2\times \text{Volume of solution}

\text{Moles of }Pb(NO_3)_2=0.700M\times 0.945L=0.662mol

Now we have to calculate the moles of NH_4I

The balanced chemical reaction is:

Pb(NO_3)_2(aq)+2NH_4I(aq)\rightarrow PbI_2(s)+2NH_4NO_3(aq)

From the balanced chemical reaction we conclude that,

As, 1 mole of Pb(NO_3)_2 react with 2 moles of NH_4I

So, 0.662 mole of Pb(NO_3)_2 react with 0.662\times 2=1.32 moles of NH_4I

Now we have to calculate the volume of NH_4I

\text{Volume of }NH_4I=\frac{\text{Moles of }NH_4I}{\text{Concentration of }NH_4I}

\text{Volume of }NH_4I=\frac{1.32mol}{0.450mol/L}=2.93L

Now we have to calculate the moles of PbI_2

From the balanced chemical reaction we conclude that,

As, 1 mole of Pb(NO_3)_2 react to give 1 moles of PbI_2

So, 0.662 mole of Pb(NO_3)_2 react to give 0.662 moles of PbI_2

Thus, the number of moles of PbI_2 formed from the reaction is, 0.662 moles.

7 0
3 years ago
Which observation would best support that the bond present was a covalent bond?
DIA [1.3K]

Answer:

A covalent bond is present between two non-metals that share electrons in their molecular structure.

Explanation:

Examples of covalent bonds may be between carbon dioxide or water. And there may be three types of covalent bonds such as ionic, covalent and polar. In the first type, there is a transfer of an electron resulting in a gain for one of the atoms. In the second type, there is a sharing of electrons between the atoms. The third type is characterized by a difference in electronegativity between atoms.

4 0
3 years ago
How many significant figures are in this<br> measurement?<br> 10.006 L
bixtya [17]

Answer: There are 5 significant figures in 10.006L

Explanation: Since there is a decimal point, all the digits after the decimal point also count as significant figures. Below is a key to help yu out:

Not Significant:

- Leading zeroes(in decimal): example- 0.0023= 2 sig figs

- Trailing zeroes with no decimal point: example- 2300= 2 sig figs

Significant:

- middle zeroes: example- 4003= 4 sig figs

-trailing zeroes with decimal point: example- 23.00= 4 sig figs

7 0
3 years ago
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