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SpyIntel [72]
3 years ago
8

Which of the following pairs of atoms represent isotopes?

Chemistry
2 answers:
Ostrovityanka [42]3 years ago
8 0

Answer:

B. ^{12}C, ^{14} C

Explanation:

Isotopes are atoms of the same element that have the same number of protons (needless to say since they are from the same element) but they have different numbers of neutrons and hence masses.

B. ^{12}C, ^{14} C

These are two different atoms from the same element, carbon with the same number of protons but different number of neutrons hence the different relative atomic masses

gladu [14]3 years ago
5 0
Isotopes have same atomic number but different atomic mass number.
Hence option B is correct.

Hope this helps you!
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A sample of krypton gas collected at a pressure of 1.31 atm and a temperature of 26.0°C is found to occupy a volume of 23.3 lite
djyliett [7]

Mol of Kr gas = 1.244

<h3>Further explanation</h3>

In general, the gas equation can be written  

<h3> PV=nRT </h3>

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08205 L.atm / mol K  

T = temperature, Kelvin  

P=1.31 atm

V=23.3 L

T=26+273=299 K

mol of sample :

\tt n=\dfrac{PV}{RT}=\dfrac{1.31\times 23.3}{0.08205\times 299}=1.244

3 0
3 years ago
How is nitrogen converted in the nitrogen cycle
castortr0y [4]

Answer:

nitrogen fixing bacteria

Explanation:

These bacteria made the nitrogen suitable for plant use.

5 0
3 years ago
How many chloride ions are in a 220 grams of calcium chloride?
steposvetlana [31]

Answer: Hello, There! Your Answer is Below

2.4 x 1024 ions

Explanation:

220 g of CaCl₂  =  X moles

Solving for X,

                                                X  =  (220 g × 1 mol) ÷ 110.98 g

                                                X  =  1.98 moles

As,

                          1 mole contained  =  1.20 × 10²⁴ Cl⁻ Ions

Then,

                   1.98 mole will contain  =  X Cl⁻ Ions

Solving for X,

                                                 X  =  (1.98 mol × 1.20 × 10²⁴ Ions) ÷ 1mol

                                                 X  =  2.38 × 10²⁴ Cl⁻ Ions

Hope this Helps!

Have a great DAy!

`August~

3 0
2 years ago
59x<br> 56x<br> 35<br> 35<br> What do they have in common
wel

Answer:

5

Explanation:

They have 5 in common but different x

8 0
3 years ago
Read 2 more answers
Ptrpared a solution of sodium chloride (NaCl) by measuring out 49.Umol of sodium chloride into 150. ML. Volumetric flask and fil
ArbitrLikvidat [17]

Answer:

The answer to your question is below

Explanation:

Data

Substance = NaCl

moles of NaCl = 49

volume = 150 ml

Process

Molarity is a unit of concentration that makes a relation of the moles of a substance and the volume.

Molarity = moles / volume (L)

1.- Convert 150 ml to L

                  1000 ml ------------------ 1 L

                     150 ml -----------------  x

                      x = (150 x 1) / 1000

                      x = 0.15 L

2.- Substitution

Molarity = 49 / 0.15

Molarity = 326. 7

I have a doubt if the number of moles is 49 moles or 49μmoles            

4 0
3 years ago
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