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fgiga [73]
3 years ago
5

4. How many molecules are in the following formula? 3Fe2O3

Chemistry
1 answer:
serg [7]3 years ago
4 0

Answer:

Option C, 3 molecule is correct

Explanation:

The formula is of Ferric oxide

3Fe2O3

The number 3 ahead the chemical formula represents the number of molecules of the given substance. In general the formula of iron (III) oxide is Fe2O3

Since there are three molecules of it hence the formula is written as 3Fe2O3

Option C, 3 molecule is correct

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To a 25.00 mL volumetric flask, a lab technician adds a 0.250 g sample of a weak monoprotic acid, HA , and dilutes to the mark w
Basile [38]

Answer: The number of moles of the weak acid in the solution is 0.00396

Explanation:

To calculate the number of moles for given molarity, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}      

a) {\text{Moles of}KOH=0.0846M\times 0.04683L=0.00396mol

The balanced chemical reaction is:

HA+KOH\rightarrow KA+H_2O  

1 mole of base uses = 1 mole of HA  

0.00396  moles of base use = \frac{1}{1}\times 0.00396=0.00396 moles of HA  

Thus the number of moles of the weak acid in the solution is 0.00396

6 0
3 years ago
Help? It would honestly mean a lot :(
melomori [17]

Answer:

1 1

5 2

6 1

8 3

10 3

6 3

9 3

13 3

Explanation:

First of you add the subscripts (the little numbers after the letters) and multiply the big numbers before the letters together to get the number of atoms

For Example:

O= 1 atom

Si{2}= 2 atoms

Mg{5}C{6}= 11 atoms

3Na{2}= 6 atoms

O(SiNa){2}= OSi{2}Na{2}= 5 atoms

Each Capital letter is a new Element

For Example:

O = 1 Element

NaSi = 2 Elements

6 0
3 years ago
A large majority of proteins contain ________.
STALIN [3.7K]

Answer: option C. Sulphur

Explanation:

4 0
3 years ago
Juan and Tanisha wanted to build a track for their marbles. They wanted to see how fast their marbles would run down one
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Answer:

c

Explanation:

i took the test

4 0
4 years ago
Imagine you are making Kool Aid. Kool Aid comes in packets. The powder inside the packets is made up of very small particles. Th
lina2011 [118]

Answer:

Because the molecules have not been in water so they are not moving around each other

Explanation:

4 0
3 years ago
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