March 29, 2024, 10:55:37 AM
Forum Rules: Read This Before Posting


Topic: Significant digits  (Read 1607 times)

0 Members and 1 Guest are viewing this topic.

Offline danimalswim

  • Very New Member
  • *
  • Posts: 2
  • Mole Snacks: +0/-0
Significant digits
« on: November 26, 2013, 12:30:37 AM »
Fe2(CO3)3=Fe2O3+3CO2
If I have 5.00 grams of iron (III) carbonate, how many mL of CO2 will I produce?
5.00 grams is .017 mol of Fe2(CO3)3, which converts to .051 mol of CO2=1143 mL.
Why is it not 1140 mL?
Did I get all of my significant digits correct?
Thank you! :)

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27635
  • Mole Snacks: +1799/-410
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Significant digits
« Reply #1 on: November 26, 2013, 03:36:46 AM »
1143 to 3 significant digits is 1.14×103 (or 1140).

Note that 5.00g of Fe2(CO3)3 is 0.0171 moles (3 significant digits), not 0.017 (2 SD).
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Sponsored Links