Chemistry

posted by .

I have a Chemistry question which should be very simple but I do not know what significant figures are.

Assuming the following numbers are measurements and using the rules for significant figures, determine the answer for the following calculation.

(15.5/42)*219.5=

1. 81.0059
2. 81.006
3. 81.01
4. 81.0
5. 81

The number obtained from the calculator is 81.00595238 should I just round or are significant figures something else entirely?

  • Chemistry -

    Here is a good site to read about s.f.
    http://www.chemteam.info/SigFigs/SigFigs.html

    15.5 has 3 s.f.
    42 has 2 s.f.
    219.5 has 4 s.f.
    This is a multiplication/division problem.
    So the answer may have no more than xxxx s.f.; therefore, the answer is xxxxx.

  • Chemistry -

    Thanks a lot!

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Science (Chemistry!)

    I just do not understand ANYTHING about multiplying/dividing/adding/subtracting significant figures! For example, the problem is: Solve the following to the correct number of significant figures: (5.039)(0.0074) What am I supposed …
  2. chemistry

    Which of the following is NOT true? A. A measurement contains significant figures and units. B. All numbers should be recorded from a digital readout. C. The uncertain digit is estimated between the last two markings. D. If an average
  3. Science

    I'm a little confused when it comes to significant figures. Where it doesn't make sense to me is when zeros come before and after a number. For example: My book states that zeros that come before a digit are NEVER significant. Now …
  4. chemistry(can anyone help me with this)

    Which of the following is NOT true? A. Except for absorbance, most measurements contain significant figures and units. B. All numbers should be recorded from a digital readout. C. The uncertain digit is estimated between the last two
  5. chemistry

    this is over significant digits. -Indicate how many significant figures are in each of the following measurements: e) 4.0 X 10-5 kg i got 1 significant digit, but i'm not sure it if it's right... (& i can't ask my teacher, the situation …
  6. significant figures- chemistry

    I'm having trouble understanding significant figures. If a problem is requires two equations to finish, which of the original measurements do I use to figure out the significant figure?
  7. Chemistry

    The question asks me to find the absolute error using the true value=.1025M, and the mean=.1077 The answer I got was .0052...how would I convert this to 4 significant figures?
  8. Chemistry

    Hi guys! I just learned about significant figures today, and I have a question about them. My teacher gave us a problem where all values have what I think is four significant figures (like 44.56) except the value for temperature (which …
  9. physics

    Find the direction and magnitude of the following vectors. A⃗ =( 22 m )x^+( -15 m )y^ Express your answer in degrees using three significant figures. θA = Part B Express your answer in meters using two significant figures. |A⃗ …
  10. PHYSICS

    PLEASE HELP WITH PART E AND F THANKS!! Find the direction and magnitude of the following vectors. A⃗ =( 22 m )x^+( -15 m )y^ Express your answer in degrees using three significant figures. θA = THE ANSWER IS-34 Part B Express your …

More Similar Questions