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fredd [130]
3 years ago
13

NEED HELP FAST!!!!!!!!!!!!

Chemistry
1 answer:
erma4kov [3.2K]3 years ago
8 0
Covalent for the first one
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To what volume (in mL) would you need to dilute 20.0 mL of a 1.40 M solution of LiCN to make a 0.0880 M solution of LiCN?
CaHeK987 [17]

Answer:

To 318.18 mL would you need to dilute 20.0 mL of a 1.40 M solution of LiCN to make a 0.0880 M solution of LiCN

Explanation:

Dilution is the reduction of the concentration of a chemical in a solution and consists simply of adding more solvent.

In a dilution the amount of solute does not vary. But as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

In a solution it is fulfilled:

Ci* Vi = Cf* Vf

where:

  • Ci: initial concentration
  • Vi: initial volume
  • Cf: final concentration
  • Vf: final volume

In this case:

  • Ci= 1.40 M
  • Vi= 20 mL
  • Cf= 0.088 M
  • Vf= ?

Replacing:

1.40 M* 20 mL= 0.088 M* Vf

Solving:

Vf=\frac{1.40 M* 20 mL}{0.088 M}

Vf= 318.18 mL

<u><em>To 318.18 mL would you need to dilute 20.0 mL of a 1.40 M solution of LiCN to make a 0.0880 M solution of LiCN</em></u>

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

7 0
3 years ago
If a book has a weight of 23.2 N on Earth, what is its mass?
Julli [10]

Answer:  Mass is 2,37 kg

Explanation: Weight G = mg, and g = 9.81 m/s² on Earth.

m = W/g = 23.2 N /  9.81 m/s²

8 0
2 years ago
Plsss help ASAP Dont guess
alexira [117]

Answer:

B

Explanation:

5 0
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Solve the following division problem: (3.4 x 10^7)/(6.8 x 10^3) =
eduard

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5000

Explanation:

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I believe it's the lowest portion of the atmosphere

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