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Firdavs [7]
2 years ago
10

How many molecules are present in a sample of carbon dioxide, CO2 with a mass of 168.2?

Chemistry
1 answer:
Hoochie [10]2 years ago
6 0

Answer:

Explanation:

Always remember that 1 mole is just a way of saying 6.02 x 10^23 molecules. Because this is a huge number it is easier to use moles. It corresponds nicely ecause 12 grams of carbon is one mole (note the Mr of carbon is 12) and 44g of CO2 is one mole of CO2 (note that CO2 has Mr 44).  You need to use the equation n = m/Mr . In words this is: number of moles = the mass (in grams) divided by the Molar Mass.  You can think of this as the number of moles is equal to the mass of the amount you have divided by the mass of one mole (the molar mass).   To find the molar mass of CO2 you need to use the periodic table.   12 + 16 + 16 = 44  So you need to do:  168.2 divided by 44 which will give you number of moles.

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Plz help me well mark brainliest if you are correct!
lara [203]

Answer:

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Explanation:

5 0
2 years ago
Explain why, when performing stoichiometric calculations, it is
pshichka [43]

Answer:

Stoichiometric Coefficients

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3 0
2 years ago
What is the mass of 2.5 mol of ca, which has a molar mass of g/mol
swat32
Atomic mass Ca = 40 a.m.u

1 mole Ca ----------- 40 g
2.5 mols Ca -------- ( mass Ca )

Mass Ca = 2.5 x 40 / 1

Mass Ca = 100 / 1

= 100 g of Ca

hope this helps!
3 0
3 years ago
Which substance is most likely to heat up the fastest?
ddd [48]
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7 0
2 years ago
Read 2 more answers
In the laboratory, a student dilutes 13.5 mL of a 11.6 M hydroiodic acid solution to a total volume of 100.0 mL. What is the con
igomit [66]

Answer: The concentration of the diluted solution is 1.566M.

Explanation:

The dilution equation is presented as this: M_{s} V_{s} =M_{d} V_{d}.

·M= molarity (labeled as M)

·V= volume (labeled as L)

·s= stock solution (what you started with)

·d= diluted solution (what you have after)

Now that we know what each part of the formula symbolizes, we can plug in our data.

11.6M*13.5mL=M_{d} *100mL

We cannot leave it like this because the volumes must be in Liters, not milliliters. To convert this, we divide the milliliters by 1000.

13.5mL/1000=0.0135L     100mL/1000=0.1L

Now that we have the conversions, let's plug them into the equation.

11.6M*0.0135L=M_{d} *0.1L

The only thing that we need to do now is actually solving the answer.

M_{d} =\frac{11.6M*0.0135L}{0.1L}       M_{d} =1.566M

From the work shown above, the answer is 1.566M.

I hope this helps!! Pls mark brainliest :)

7 0
1 year ago
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