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Rashid [163]
3 years ago
12

A volume of liquid measuring ____ is most accurately measured and dispensed using a ____ pipetter.

Chemistry
1 answer:
maksim [4K]3 years ago
5 0

Answer:

The correct option is: a. 0.12ml, p200

Explanation:

A pipette is a laboratory instrument, which is used to measure and transfer a particular volume of liquid. A pipette comes in various designs with differing levels of precision and accuracy.

An air displacement micropipette is an adjustable micropipette that can deliver about 0.1 µl to 1000 µl (1 ml) of liquid, depending upon the size.

A micropipette type P200 can deliver 20–200 µl liquid.

<u>Therefore, a P200 micropipette is used for measuring 0.12ml or 120µl liquid.</u>

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Hydrogen iodide, HI, is formed in an equilibrium reaction when gaseous hydrogen and iodine gas are heated together. If 20.0 g of
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Answer: D. 19.9 g hydrogen remains.

Explanation:

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}

a) moles of H_2

\text{Number of moles}=\frac{20.0g}{2g/mol}=10.0moles

b) moles of I_2

\text{Number of moles}=\frac{20.0g}{254g/mol}=0.0787moles

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According to stoichiometry :

1 mole of I_2 require 1 mole of H_2

Thus 0.0787 moles of l_2 require=\frac{1}{1}\times 0.0787=0.0787moles of H_2

Thus l_2 is the limiting reagent as it limits the formation of product and H_2 acts as the excess reagent. (10.0-0.0787)= 9.92 moles of H_2are left unreacted.

Mass of H_2=moles\times {\text {Molar mass}}=9.92moles\times 2.01g/mol=19.9g

Thus 19.9 g of H_2 remains unreacted.

5 0
3 years ago
Each year over _______ new organic compounds are produced.
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Lead has a density of 11.29 g/mL. If you had 186 g of lead, what would its volume be?
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