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LenaWriter [7]
3 years ago
6

A flask containing helium gas is connected to an open-ended mercury manometer. The open end is exposed to the atmosphere, where

the prevailing pressure is 752 torr. The mercury level in the open arm is 47 mm above that in the arm connected to the flask of helium. What is the helium pressure, in torr?
Chemistry
1 answer:
sergij07 [2.7K]3 years ago
5 0

Answer: The helium pressure is 799 torr.

Explanation:

It is known that 1 mm Hg is equal to 1 torr. As we are given an open-ended mercury manometer so, its pressure will also be equal to the atmospheric pressure which is given as 752 torr.

And, it is given that pressure of mercury level in the open arm is 47 mm above that in the arm connected to the flask of helium. Therefore, adding both the pressures we will get the pressure of helium as follows.

                (752 + 47) mm Hg

              = 799 mm Hg

or,           = 799 torr

Thus, we can conclude that the helium pressure is 799 torr.

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A 25.0-mL sample containing Cu2+ gave an instrument signal of 25.2 units (corrected for a blank). When exactly 0.500 mL of 0.027
irga5000 [103]

Answer:

The molar concentration of Cu²⁺ in the initial solution is 6.964x10⁻⁴ M.

Explanation:

The first step to solving this problem is calculating the number of moles of Cu(NO₃)₂ added to the solution:

C = \frac{n}{V} \\0.0275 = \frac{n}{0.0005} \\

n = 1.375x10⁻⁵ mol

The second step is relating the number of moles to the signal. We know the the n calculated before is equivalent to a signal increase of 19.9 units (45.1-25.2):

1.375x10⁻⁵ mol _________ 19.9 units

        x              _________  25.2 units

x = 1.741x10⁻⁵mol

Finally, we can calculate the Cu²⁺ concentration :

C = 1.741x10⁻⁵mol / 0.025 L

C = 6.964x10⁻⁴ M

7 0
4 years ago
Select the correct answer from each drop-down menu. carbon is found in all living organisms. the constant flow of carbon on eart
Nady [450]

The continuous cycling of carbon in the earyh is known as the carbon cycle.

<h3>What is the carbon cycle?</h3>

The carbon cycle is a cycle which explains the various processes by which carbon is recycled between the atmosphere and the earth.

The constant flow of carbon on earth through organisms and the air is known as the carbon cycle. Plants absorb carbon from the atmosphere in the form of carbon dioxide. They use it for respiration and food production.

Animals consume plants, transferring carbon along the food chain.

Plants and animals respire and release carbon into air. When the animals and plants die, they are eaten by decomposers.

Carbon enters back into the atmosphere in the form of carbondio dioxide.

Therefore, the continuous cycling of carbon in the earth is known as the carbon cycle.

Learn more about carbon cycle at: brainly.com/question/25845923

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5 0
2 years ago
Can beans grow inside water
fredd [130]
No, They need something to hold on to, such as dirt
8 0
4 years ago
Read 2 more answers
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The first thing you need to do is convert mL into L
so (175 mL)(.001L/1mL)=.175L then you multiply by the Molarity of H3PO4 which is 3.5mol/L so (.175L)(3.5mol/L)=.6125 mol H3PO4, and since it wants the answer in grams you then multiply (.6125molH3PO4) by the molar mass of H3P04 which is about 97.99g and your answer is 60.02g which is about 60 grams of H3PO4. Hope this helped
3 0
4 years ago
A spacecraft is traveling at a speed of 2.3 km/sec. It takes 2.5 minutes to pass a small asteroid. how wide is the asteroid (i.e
lidiya [134]

<u>Answer:</u> The spacecraft traveled 345 km during the given time.

<u>Explanation:</u>

To calculate the distance of spacecraft, we use the equation:

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We are given:

Velocity = 2.3 km/sec

Time = 2.5 mins = 150 sec             (Conversion factor: 1 min = 60 sec)

Putting values in above equation, we get:

\text{Distance}=(2.3km/s\times 150s)=354km

Hence, the spacecraft traveled 345 km during the given time.

4 0
3 years ago
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