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3 years ago

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The forensic technician at a crime scene has just prepared a luminol stock solution by adding 15.0 g of luminol into a total vol

ume of 75.0 mL of H2O. What is the molarity of the stock solution of luminol? Express your answer with the appropriate units.

1 answer:

Svet_ta [14]3 years ago

7 0

The answer is in the photo

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What is the answer to this question

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A sample of methane occupies a volume of 174.0 mL at 25 C and exerts a pressure of 1030.0 mmHg if the volume of the gas is allow

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Answer:

The pressure will be 0,37 atm.

Explanation:

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A chemist isolates a substance, made of two nonmetals, that is a gas at room temperature. The substance most likely is _____.

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The gas that a diver breathes must be maintained at a partial pressure of 0.20 atm of oxygen. More oxygen could poison the diver

Nimfa-mama [501]

<u>Answer:</u> The partial pressure of helium gas is 0.80 atm

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Dalton's law of partial pressure states that the total pressure of the system is equal to the sum of partial pressure of each component present in it.

To calculate the partial pressure of helium gas, we use the law given by Dalton, which is:

$P_T=p_{He}+p_{O_2}$

We are given:

Total pressure of the cylinder, $P_T$ = 1.00 atm

Vapor pressure of oxygen gas, $p_{O_2}$ = 0.20 atm

Putting values in above equation, we get:

$1.00=p_{He}+0.20\\\\p_{He}=1.00-0.20=0.80atm$

Hence, the partial pressure of helium gas is 0.80 atm

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3 years ago