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2 years ago

PLEASE HELP 50 POINTS

Chemistry

2 answers:

stepladder [879]2 years ago

4 0

It’s c add the side

makkiz [27]2 years ago

4 0

It’s C because u can see it’s 7 that mean if it’s was 1 the answer ganna be D

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Answer:

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3 years ago

What is the voltage across a 100 ohm circuit element that draws a current of 1 A?

andrey2020 [161]

Answer:

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Explanation:

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3 years ago

Calculate the volume (liters) of solution that can be prepared from 180. grams of K2Cr2O7 for a 0.200M solution.

Sladkaya [172]

Answer:

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Molar mass is the amount of mass that a substance contains in one mole. The molar mass of K₂Cr₂O₇ is 294 g / mole. Then you can apply the following rule of three: if by definition of molar mass 294 grams of the compound are contained in 1 mole, 180 grams are contained in how many moles?

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Molarity is a measure of the concentration of a substance that is defined as the number of moles contained in a certain volume. So, the molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

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Molarity is expressed in units $\frac{moles}{liter}$ .

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molarity= 2 M
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volume= ?

Replacing in the definition of molarity:

$2 M=\frac{0.61 moles}{volume}$

Solving:

$volume=\frac{0.61 moles}{2 M}$

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<u><em>The volume of the solution is 0.305 liters.</em></u>

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It’s electrons

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