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3 years ago

In gel electrophoresis, DNA fragments move across a gel. What causes them to move?

1 answer:

4 0

When placed in an electrical field, the negative charge found in the sugar-phosphate backbone of DNA polymers cause them to migrate towards the positive electrode.

In gel electrophoresis, electricity is used to separate fragments of DNA based on its length. DNA is place in a porous gel. The pores of the gel restricts the movement of the DNA. It then creates fragments on the DNA because its movement varies on its lengths.

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What mass, in grams, of CO2 and H2O is formed from 2.55 mol of propane?

oksian1 [2.3K]

Answer:

336.6 grams of CO₂ and 183.6 grams of H₂O are formed from 2.55 moles of propane.

Explanation:

In this case, the balanced reaction is:

C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reactant and product participate in the reaction:

C₃H₈: 1 mole
O₂: 5 moles
CO₂: 3 moles
H₂O: 4 moles

Being the molar mass of each compound:

C₃H₈: 44 g/mole
O₂: 16 g/mole
CO₂: 44 g/mole
H₂O: 18 g/mole

Then, by stoichiometry, the following quantities of mass participate in the reaction:

C₃H₈: 1 mole* 44 g/mole= 44 grams
O₂: 5 moles* 16 g/mole= 80 grams
CO₂: 3 moles* 44 g/mole= 132 grams
H₂O: 4 moles* 18 g/mole= 72 grams

So you can apply the following rules of three:

If by stoichiometry 1 mole of C₃H₈ forms 132 grams of CO₂, 2.55 moles of C₃H₈ how much mass of CO₂ will it form?

$mass of CO_{2} =\frac{2.55 moles of C_{3} H_{8}*132 gramsof CO_{2} }{ 1 mole of C_{3} H_{8}}$

mass of CO₂= 336.6 grams

If by stoichiometry 1 mole of C₃H₈ forms 72 grams of H₂O, 2.55 moles of C₃H₈ how much mass of H₂O will it form?

$mass of H_{2}O =\frac{2.55 moles of C_{3} H_{8}*72 gramsof H_{2}O }{ 1 mole of C_{3} H_{8}}$

mass of H₂O= 183.6 grams

336.6 grams of CO₂ and 183.6 grams of H₂O are formed from 2.55 moles of propane.

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3 years ago

Nagine you are repeatedly lifting a weight into the air up to a height of 2 m. Assuming in each litt

Mariulka [41]

Answer:

Explanation:

8 0

3 years ago

1.)What is the molarity of a solution that contains 55.0 grams of Na2SO4 in 250 milliliters of solution? (The mass of one mole o

Maurinko [17]

1)1.549=1.55M

2)may include all of these characteristics

3)stronger the acid

4)lower the concentration of H3O+ ions

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3 years ago

Land is a natural resource because it is used by living things to meet their needs. O True

blondinia [14]

Answer:

Absolutely True :) cause we use it all the time

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3 years ago

1b Describe the terms below: 2. adiabatic process

Ugo [173]

Answer:

defined as a process in which mo heat transfer take place

Explanation:

is a process which occurs without transferring heat /mass between the system and it's surrounding.

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3 years ago