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olga2289 [7]
2 years ago
8

12) SEP Use Mathematics Complete the table by identifying the atomic number and

Chemistry
1 answer:
Lina20 [59]2 years ago
7 0

Answer:

{^{11}_{23}}Na \\atomic \: number \:  Z = 11 \\ mass \: number = 23 \\ number \: of \: protons =  \: 11 \\ number \: of \: neutrons \:  = 12 \\  number \: of \: electrons \:  = 11 \\ mass \: number \:  - atomic \: number \:  =  \\  {p}^{ + }  =  {e}^{ - }

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When does a star reach equilibrium?
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Hydrogen gas is collected over water at 21 degrees Celsius. At 21 degrees Celsius the vapor pressure of water is 18.7 torr. If t
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Explanation :

As we are given:

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3 0
3 years ago
A 52.0 mL portion of a 1.20 M solution is diluted to a total volume of 278 mL. A 139 mL portion of that solution is diluted by a
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Answer:

C_3=0.125M

Explanation:

Hello!

In this case, we can divide the problem in two steps:

1. Dilution to 278 mL: here, the initial concentration and volume are 1.20 M and 52.0 mL respectively, and a final volume of 278 mL, it means that the moles remain the same so we can write:

V_1C_1=V_2C_2

So we solve for C2:

C_2=\frac{C_1V_1}{V_2}=\frac{52.0mL*1.20M}{278mL}\\\\C_2=0.224M

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C_3=\frac{139 mL*0.224M}{250mL}\\\\C_3=0.125M

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