Molecular biology

DNA: ng to pmol: practice problems

Work out the result for dNA: ng to pmol. Every answer here is computed by the same tested calculator the rest of the site uses, so a solution can never drift away from the maths.

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Problem 1 DNA: ng to pmol

Work out the result for dNA: ng to pmol.

  • Mass (ng): 50
  • Length (bp): 1000
Show the answer and the working

1000 bp dsDNA: 0.07576 pmol.

  1. Solve for moles: pmol = mass_ng * 1000 / (660 * bp)
  2. Substitute: pmol = 50 * 1000 / (660 * 1000) = 0.07576 pmol
  3. Picomoles per nanogram: 1000 / (660 * bp) = 0.001515 pmol/ng

Open this in the calculator to change the numbers.

Problem 2 DNA: ng to pmol

Work out the result for dNA: ng to pmol.

  • Mass (ng): 100
  • Length (bp): 4000
Show the answer and the working

4000 bp dsDNA: 0.03788 pmol.

  1. Solve for moles: pmol = mass_ng * 1000 / (660 * bp)
  2. Substitute: pmol = 100 * 1000 / (660 * 4000) = 0.03788 pmol
  3. Picomoles per nanogram: 1000 / (660 * bp) = 0.0003788 pmol/ng

Open this in the calculator to change the numbers.

Problem 3 DNA: ng to pmol

Work out the result for dNA: ng to pmol.

  • Mass (ng): 75
  • Length (bp): 5000
Show the answer and the working

5000 bp dsDNA: 0.02273 pmol.

  1. Solve for moles: pmol = mass_ng * 1000 / (660 * bp)
  2. Substitute: pmol = 75 * 1000 / (660 * 5000) = 0.02273 pmol
  3. Picomoles per nanogram: 1000 / (660 * bp) = 0.000303 pmol/ng

Open this in the calculator to change the numbers.

Problem 4 DNA: ng to pmol

Work out the result for dNA: ng to pmol.

  • Mass (ng): 100
  • Length (bp): 1500
Show the answer and the working

1500 bp dsDNA: 0.101 pmol.

  1. Solve for moles: pmol = mass_ng * 1000 / (660 * bp)
  2. Substitute: pmol = 100 * 1000 / (660 * 1500) = 0.101 pmol
  3. Picomoles per nanogram: 1000 / (660 * bp) = 0.00101 pmol/ng

Open this in the calculator to change the numbers.

Problem 5 DNA: ng to pmol

Work out the result for dNA: ng to pmol.

  • Mass (ng): 40
  • Length (bp): 2000
Show the answer and the working

2000 bp dsDNA: 0.0303 pmol.

  1. Solve for moles: pmol = mass_ng * 1000 / (660 * bp)
  2. Substitute: pmol = 40 * 1000 / (660 * 2000) = 0.0303 pmol
  3. Picomoles per nanogram: 1000 / (660 * bp) = 0.0007576 pmol/ng

Open this in the calculator to change the numbers.

Problem 6 DNA: ng to pmol

Work out the result for dNA: ng to pmol.

  • Mass (ng): 300
  • Length (bp): 5000
Show the answer and the working

5000 bp dsDNA: 0.09091 pmol.

  1. Solve for moles: pmol = mass_ng * 1000 / (660 * bp)
  2. Substitute: pmol = 300 * 1000 / (660 * 5000) = 0.09091 pmol
  3. Picomoles per nanogram: 1000 / (660 * bp) = 0.000303 pmol/ng

Open this in the calculator to change the numbers.

Problem 7 DNA: ng to pmol

Work out the result for dNA: ng to pmol.

  • Mass (ng): 15
  • Length (bp): 5000
Show the answer and the working

5000 bp dsDNA: 0.004545 pmol.

  1. Solve for moles: pmol = mass_ng * 1000 / (660 * bp)
  2. Substitute: pmol = 15 * 1000 / (660 * 5000) = 0.004545 pmol
  3. Picomoles per nanogram: 1000 / (660 * bp) = 0.000303 pmol/ng

Open this in the calculator to change the numbers.

Problem 8 DNA: ng to pmol

Work out the result for dNA: ng to pmol.

  • Mass (ng): 100
  • Length (bp): 3000
Show the answer and the working

3000 bp dsDNA: 0.05051 pmol.

  1. Solve for moles: pmol = mass_ng * 1000 / (660 * bp)
  2. Substitute: pmol = 100 * 1000 / (660 * 3000) = 0.05051 pmol
  3. Picomoles per nanogram: 1000 / (660 * bp) = 0.0005051 pmol/ng

Open this in the calculator to change the numbers.

Problem 9 DNA: ng to pmol

Work out the result for dNA: ng to pmol.

  • Mass (ng): 10
  • Length (bp): 1000
Show the answer and the working

1000 bp dsDNA: 0.01515 pmol.

  1. Solve for moles: pmol = mass_ng * 1000 / (660 * bp)
  2. Substitute: pmol = 10 * 1000 / (660 * 1000) = 0.01515 pmol
  3. Picomoles per nanogram: 1000 / (660 * bp) = 0.001515 pmol/ng

Open this in the calculator to change the numbers.

Problem 10 DNA: ng to pmol

Work out the result for dNA: ng to pmol.

  • Mass (ng): 300
  • Length (bp): 4000
Show the answer and the working

4000 bp dsDNA: 0.1136 pmol.

  1. Solve for moles: pmol = mass_ng * 1000 / (660 * bp)
  2. Substitute: pmol = 300 * 1000 / (660 * 4000) = 0.1136 pmol
  3. Picomoles per nanogram: 1000 / (660 * bp) = 0.0003788 pmol/ng

Open this in the calculator to change the numbers.

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