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ludmilkaskok [199]
4 years ago
8

Which part of a chemical formula indicates the number of atoms of an element that make up a molecule? A. plus signs B. subscript

s C. coefficients D. chemical symbols
Chemistry
2 answers:
krok68 [10]4 years ago
8 0

<u>Answer:</u> The correct answer is Option B.

<u>Explanation:</u>

For the given options:

<u>Option A:</u> Plus sign is written in a chemical equation to show the number of chemical species reacting or getting produced.

Option B: Subscript numbers are defined as the number of atoms of each element present in a compound.

For Example: In H_2O, 2 atoms of hydrogen element is there and 1 atom of oxygen element is there.

<u>Option C:</u> Coefficients are defined as the numbers which are written in front of the atoms or molecules in a chemical reaction. They represent the number of moles of substance in a chemical reaction.

<u>Option D:</u> Chemical symbols are used to write the short form of the elements.

Hence, the correct answer is Option B.

Elina [12.6K]4 years ago
5 0

Hey there!

I believe the answer you are looking for is D.

If i am incorrect, I am very sorry. I would love any feedback!

Have a nice day and Happy Halloween!

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1. Silver nitrate will react with aluminum metal, yielding aluminum nitrate and silver metal. If you start with 0.223 moles of a
Archy [21]

Answer:

Explanation:

1)

Given data:

Number of moles of aluminium = 0.223 mol

Mass of silver produced = ?

Solution:

Chemical equation:

3AgNO₃  +   Al  →  3Ag + Al(NO₃)₃

Now we will compare the moles of Al with silver.

                               Al           :            Ag

                                1            :             3

                                0.223   :         3×0.223= 0.669 mol

Grams of silver:

Mass = number of moles × molar mass

Mass = 0.669 mol × 107.87 g/mol

Mass = 72.2 g

2)

Given data:

Number of moles of mercury(II) oxide produced = 3.12 mol

Mass of mercury = ?

Solution:

Chemical equation:

2Hg + O₂  →   2HgO

Now we will compare the moles of mercury with mercury(II) oxide.

                         HgO         :         Hg

                            2            :          2

                          3.12          :       3.12

Mass of Hg:

Mass = number of moles × molar mass

Mass = 3.12 mol × 200.59 g/mol

Mass = 625.84 g

3)

Given data:

Number of moles of dinitrogen pentoxide = 12.99 mol

Mass of oxygen = ?

Solution:

Chemical equation:

2N₂  + 5O₂   →  2N₂O₅

Now we will compare the moles of N₂O₅ with oxygen.

                 N₂O₅          :           O₂

                     2            :             5

                    12.99      :         5/2×12.99 = 32.48 mol

Mass of oxygen:

Mass = number of moles × molar mass

Mass = 32.48 mol × 32 g/mol

Mass = 1039.36 g

4)

Given data:

Number of moles of benzene = 0.103 mol

Mass of carbon dioxide = ?

Solution:

Chemical equation:

2C₆H₆  + 15O₂   →  12CO₂ + 6H₂O

Now we will compare the moles of N₂O₅ with oxygen.

                  C₆H₆         :           CO₂

                     2            :             12

                    0.103      :         12/2×0.103 = 0.618 mol

Mass of carbon dioxide:

Mass = number of moles × molar mass

Mass = 0.618 mol × 44 g/mol

Mass = 27.192 g

3 0
3 years ago
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