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Viefleur [7K]
2 years ago
10

The various atomic masses of the same element are called neutrino positron critical mass isotopes

Chemistry
2 answers:
IceJOKER [234]2 years ago
4 0

Answer:

isotopes are the various atomic masses of the same element

Mariana [72]2 years ago
3 0
The various atomic masses of the same element are called<u> isotopes</u>. They have the same number of protons but different number of neutrons.
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An element consists of two isotopes. One with a mass of 79.95 amu and an abundance of 29.9%. The second isotope has a mass of 81
galina1969 [7]

 the molar  mass of the element  is  81.36 g/mol

<u><em>calculation</em></u>

step 1 : multiply  each %abundance  of the isotope  by   its mass  number

that is 79.95 x 29.9 =2391

           81.95 x 70.1  = 5745

Step 2: add them together

2390.5 + 5744.7 =8136

Step 3: divide by 100

= 8136/100 = 81.36  g/mol

5 0
3 years ago
Is a CAS number a physical or chemical property
katrin [286]
Chemical


Hope that helps
5 0
2 years ago
Describe the relationship between predator and prey in a balanced ecosystem. Please hellppp.
Umnica [9.8K]

Answer:without predators, to keep prey from producing too many and over eating, the ecosystem suffers as there isn’t enough for the prey themselves to eat.

Explanation:

3 0
3 years ago
A student prepares an iron standard solution in a 50.00 mL volumetric flask. The iron stock concentration is 0.0001974 M. A stud
Serhud [2]

Answer:

0.00011765 M

Explanation:

When a solution is prepared by dilution, the volumes and concentrations are related by:

C1*V1 = C2*V2

Where C1 is the concentration of the solution 1, V1 is the volume of the solution 1, C2 is the concentration of solution 2, and V2 is the volume of solution 2.

The stock solution is the solution 1, and the standard solution, the solution 2, so:

0.0001974*29.80 = C2*50.00

C2 = 0.00011765 M

4 0
3 years ago
A. What is the pH of a solution with a [H+] of 6.8 x 10^-11?
inysia [295]

Answer:

[H+] = 6.8×10^-11

so, pH = - log[H+]

= - log [6.8×10^-11]

= -(-10.167)

= 10.167

6 0
2 years ago
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