Chemical Forums

Please login or register.

Login with username, password and session length

Sponsored links

Pages: [1]   Go Down

Author Topic: Few Chem Questions!  (Read 19567 times)

0 Members and 2 Guests are viewing this topic.

nothincomin

  • Regular Member
  • ***
  • Mole Snacks: +0/-0
  • Offline Offline
  • Posts: 34
Few Chem Questions!
« on: May 20, 2010, 08:42:48 AM »

Step by step answers and explanations please!

1) How many electrons would it take to the equal the mass of a proton?

2) A helium nucleus has two protons and two neutrons. How many electrons would it take to equal the mass of a helium nucleus?
Logged

sjb

  • Global Moderator
  • Sr. Member
  • ***
  • Mole Snacks: +212/-41
  • Online Online
  • Gender: Male
  • Posts: 3361
Re: Few Chem Questions!
« Reply #1 on: May 20, 2010, 10:00:56 AM »

Step by step answers and explanations please!

1) How many electrons would it take to the equal the mass of a proton?

2) A helium nucleus has two protons and two neutrons. How many electrons would it take to equal the mass of a helium nucleus?

What is the mass of an electron? Of a proton? Of a neutron? What about binding energy?
Logged

nothincomin

  • Regular Member
  • ***
  • Mole Snacks: +0/-0
  • Offline Offline
  • Posts: 34
Re: Few Chem Questions!
« Reply #2 on: May 20, 2010, 04:35:05 PM »

Mass of Proton- 1.67262 X 10^-27
Mass of Electron 0.00091 X 10^-27

Mass of Proton/Mass of Electron
1.67262 X 10^-27/ 0.00091 X 10^-27= 1838.04 g
So therefore it would take 1838.04g of electrons to equal the mass of a proton. Let me know if I'm wrong.
Logged

AWK

  • Retired Staff
  • Sr. Member
  • *
  • Mole Snacks: +448/-78
  • Offline Offline
  • Gender: Male
  • Posts: 6247
Re: Few Chem Questions!
« Reply #3 on: May 20, 2010, 07:18:31 PM »

Quote
So therefore it would take 1838.04g of electrons to equal the mass of a proton. Let me know if I'm wrong.
OK

Quote
1838.04 g
Should be without mass unit (g)
Logged
AWK

nothincomin

  • Regular Member
  • ***
  • Mole Snacks: +0/-0
  • Offline Offline
  • Posts: 34
Re: Few Chem Questions!
« Reply #4 on: May 21, 2010, 03:53:17 PM »

Step by step answers and explanations please!

1) How many electrons would it take to the equal the mass of a proton?

2) A helium nucleus has two protons and two neutrons. How many electrons would it take to equal the mass of a helium nucleus?

For the 2nd question do I multiply 4 (protons + neutrons) X mass of electrons (0.00091 X 10^-27)?
Logged

Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Mole Snacks: +1624/-395
  • Offline Offline
  • Gender: Male
  • Posts: 24815
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Few Chem Questions!
« Reply #5 on: May 21, 2010, 10:57:50 PM »

For the 2nd question do I multiply 4 (protons + neutrons) X mass of electrons

Why multiply? What will be units of your answer if you multiply mass X mass?

If I will ask you how many apples weight the same as you would you multiply your weight with apple weight?
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info, PZWT_s1

nothincomin

  • Regular Member
  • ***
  • Mole Snacks: +0/-0
  • Offline Offline
  • Posts: 34
Re: Few Chem Questions!
« Reply #6 on: May 22, 2010, 06:25:05 AM »

So instead I would take mass of the helium nucleus/mass of an electron?

(2(1.67262 X 10^-27)) + (2(1.67493^10^-27))/ (0.00091 X10^-27)= 7357.25 electrons to equal the mass of the helium nucleus.
« Last Edit: May 22, 2010, 06:59:49 AM by nothincomin »
Logged

Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Mole Snacks: +1624/-395
  • Offline Offline
  • Gender: Male
  • Posts: 24815
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Few Chem Questions!
« Reply #7 on: May 22, 2010, 06:47:21 AM »

Close, and in general good approach, unfortunately final result is incorrect. Mass of helium nucleus is smaller than the sum of the masses of protons and neutrons, google "mass deficit".
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info, PZWT_s1

nothincomin

  • Regular Member
  • ***
  • Mole Snacks: +0/-0
  • Offline Offline
  • Posts: 34
Re: Few Chem Questions!
« Reply #8 on: May 22, 2010, 07:09:37 AM »

Were you referring to the the mass of a neutron? It was a typo, fixed it now.
Logged

Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Mole Snacks: +1624/-395
  • Offline Offline
  • Gender: Male
  • Posts: 24815
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Few Chem Questions!
« Reply #9 on: May 22, 2010, 07:54:31 AM »

I have explained precisely what I was referring to. Have you read my post?
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info, PZWT_s1
Pages: [1]   Go Up
 

Mitch Andre Garcia's Chemical Forums 2003-Present.

Page created in 0.07 seconds with 23 queries.