Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

drasy22 Group Title

Determine the number of moles of compound in each of the following samples.? 4.50g H2O 471.6g Ba(OH)2 129.68g Fe3(PO4)2

  • one year ago
  • one year ago

  • This Question is Open
  1. drasy22 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    @UnkleRhaukus

    • one year ago
  2. UnkleRhaukus Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    do you know how to find the molar mass of a compound?

    • one year ago
  3. UnkleRhaukus Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    we can find the molar mass of a compound by adding up the molar masses of the atoms in it. you can find the molar mass of each type of atom using a periodic table

    • one year ago
  4. UnkleRhaukus Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \[M_{\text H}=1.0 [\text {g/mole}]\]\[M_{\text O} =16.0[\text {g/mole}]\] \[M_{\text{H}_2\text{O}}=2\times M_{\text H}+M_{\text O}\]

    • one year ago
  5. UnkleRhaukus Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    once you have found the molar masses of the compounds divide the masses of the samples by the molar masses this will give you the number of moles in each sample

    • one year ago
  6. UnkleRhaukus Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    I'll give you an example: _____ Say you have 42.5 grams of Ammonia ( \(\text{NH}_3\) ) and you want to know the number of moles this is. •First we find the molar mass of Ammonia \[M_{\text{NH}_3}=M_{\text N}+3\times M_{\text H}\] using the periodic table we find \(M_{\text H}=1.0 [\text {g/mole}]\), \(M_{\text N}=14.0 [\text {g/mole}]\) \[M_{\text{NH}_3}=14.0[\text {g/mole}]+3\times 1.0[\text {g/mole}]\]\[\qquad\qquad=17.0[\text {g/mole}]\] •Now we divide mass by the molar mass to find the number of moles \[N_{\text{NH}_3}=\frac{m_{\text{NH}_3}}{M_{\text{NH}_3}}=\frac{42.5[\text g]}{17.0[\text {g/mole}]}=2.5[\text{mol}]\] ______ so we have found that 42.5 grams of ammonia is two and a half moles

    • one year ago
  7. UnkleRhaukus Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    @drasy22

    • one year ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.