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bekas [8.4K]
2 years ago
11

How many atoms are in 25.0 grams of carbon?

Chemistry
1 answer:
mars1129 [50]2 years ago
5 0

mol = 25/12

= 2.083 mol

1 mol = 6.02 × 10^23 atoms

2.083 mol = X

X = 2.083/1 × 6.02 × 10^23

= 1.254 × 10^24 atoms

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it has a fixed volume it can also be compressed

Explanation:

a gases molecules don't move slow because they are not solid and are not compacted.

a gas does not have a fixed shape because there is nothing to hold its shape

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Identify the substances that are likely to dissociate in water. Check all that apply
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True or False ... In a chemical change, a new<br> substance is formed.
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3 years ago
What is the molariity of a 50.0 mL aqueous solution containing 10.0 grams of table salt, NaCl?
tia_tia [17]

Answer:

3 mol/L

Explanation:

You should know or have the equation to solve for Molarity which is;

M = n/v           (M: Molarity) (n: moles of solute) (v: Liters of solute)

You can start off differently but I would start by converting the mL to L. This is your "v" value.

50.0 mL/ 1000 mL = 0.05 L

Now, you have to convert grams to moles in order to solve for molarity (M).

1.) On the periodic table find the molecular weights of Na and Cl.

Na= 22.99 g/mol         Cl= 35.45g/mol

2.) Add them together to have their combined molecular weights.

22.99 + 35.45= 58.44 g/mol

3.) Now, you're going to use the "picket fence method" or whichever your teacher taught you to convert from grams to moles. This will be your "n" value. (I cannot show it on here without it looking weird, so my sincere apologies.)

10.0 g/ 58.44 g = 0.17111 mol

4.)You are now going to plug in your answers into the equation for Molarity.

M= 0.17111 mol / 0.05 L = 3.4222

5.) I am sure your professor might be a stickler so for sig figs sake when you multiply or divide use the smallest amount of sig figs you see which is 1. Round 3.4222 to 3 mol/L

Sorry this explanation is long let me know if you need a better more written out sample.

3 0
3 years ago
Calculate how many grams of the product form when 16.7 g of oxygen gas completely reacts with solid chromium. Assume that there
34kurt

<u>Answer:</u> The mass of product formed is 79.344 g.

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}     .....(1)

Given mass of oxygen = 16.7 g

Molar mass of oxygen = 32 g/mol

Putting values in equation 1, we get:

\text{Moles of oxygen}=\frac{16.7g}{32g/mol}=0.522mol

The chemical reaction for the formation of chromium oxide follows the equation:

4Cr+3O_2\rightarrow 3Cr_2O_3

By Stoichiometry of the reaction:

3 moles of oxygen produces 3 moles of chromium oxide.

So, 0.522 moles of oxygen will produce = \frac{3}{3}\times 0.522=0.522mol of chromium oxide.

Now, calculating the mass of chromium oxide from equation 1, we get:

Molar mass of chromium oxide = 152 g/mol

Moles of chromium oxide = 0.522 moles

Putting values in equation 1, we get:

0.522mol=\frac{\text{Mass of chromium oxide}}{152g/mol}\\\\\text{Mass of chromium oxide}=79.344g

Hence, the mass of chromium oxide produced in the given reaction is 79.344 grams.

3 0
3 years ago
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