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____ [38]
3 years ago
8

What is the mass percentage for copper ?

Chemistry
1 answer:
RideAnS [48]3 years ago
3 0

Answer:

Explanation:

To find the mass percent composition of an element, divide the mass contribution of the element by the total molecular mass. This number must then be multiplied by 100% to be expressed as a percent.

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What size pipette accurately measures 0.8 ml of fluid? indicate the volume and accuracy of the pipette.
chubhunter [2.5K]

The pipette that accurately measures 0.8mL of fluid is P1000 micropipette.

It is given that:-

The volume of fluid = 0.8mL

We know that,

1 mL = 1000 microliter.

Hence,

0.8 mL = 0.8*1000 microliter = 800 microliter

We know that, a P1000 micropipette's volume ranges between 200 microliter to 1000 micro liter.

As,

200 < 800 < 100

Hence, P1000 micropipette is the right instrument.

The accuracy of this pipette decreases as volume decreases. Since the value 800 is near the maximum volume 1000 of the pipette, the accuracy of the pipette will be within a few percentages of the actual value.

To learn more about pipette, here:-

brainly.com/question/15343680

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Answer:

they need the exchange so they can grow, obtain energy, and get rid of waste. It also helps to mantian a balance of amterials in the cell.

Explanation:

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zero because its not going anywhere its stationary

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