Chemical Forums
1 Hour
1 Day
1 Week
1 Month
Forever
October 31, 2024, 07:53:56 PM
Forum Rules
: Read This Before Posting
Home
Help
Search
Login
Register
Chemical Forums
Chemistry Forums for Students
High School Chemistry Forum
Atomic mass of an unknown element
« previous
next »
Print
Pages: [
1
]
Go Down
Topic: Atomic mass of an unknown element (Read 8164 times)
0 Members and 2 Guests are viewing this topic.
dipndots
New Member
Posts: 6
Mole Snacks: +0/-0
Atomic mass of an unknown element
«
on:
September 20, 2007, 11:32:39 PM »
So heres the question:
It is found that 0.119g of element Z contains 1.50 x 10^21 atoms. The atomic mass of Z is..
Logged
Yggdrasil
Retired Staff
Sr. Member
Posts: 3215
Mole Snacks: +485/-21
Gender:
Physical Biochemist
Re: Atomic mass of an unknown element
«
Reply #1 on:
September 21, 2007, 12:40:38 AM »
Please read the
Forum Rules
. You should that you've at least attempted to answer the problem before we will help you.
Logged
Padfoot
Full Member
Posts: 221
Mole Snacks: +23/-2
Re: Atomic mass of an unknown element
«
Reply #2 on:
September 21, 2007, 04:26:21 AM »
What is
atom
ic
mass
?
Logged
dieded
Very New Member
Posts: 1
Mole Snacks: +0/-0
Re: Atomic mass of an unknown element
«
Reply #3 on:
September 22, 2007, 06:30:21 AM »
Remember the
Avogadro constant
.
Approximately 6 * 10^23 atoms of Z will make up the atomic mass of Z.
And Yggdrasil you should at least at least help out dipndots a bit.
Logged
Borek
Mr. pH
Administrator
Deity Member
Posts: 27820
Mole Snacks: +1808/-412
Gender:
I am known to be occasionally wrong.
Re: Atomic mass of an unknown element
«
Reply #4 on:
September 22, 2007, 07:24:30 AM »
Mass of 5 marbles is found to be 3 g, what is a mass of a dozen?
Logged
ChemBuddy
chemical calculators - stoichiometry, pH, concentration, buffer preparation,
titrations.info
kiet
Very New Member
Posts: 1
Mole Snacks: +0/-1
Re: Atomic mass of an unknown element
«
Reply #5 on:
September 22, 2007, 09:33:12 AM »
1 mol atoms has 6.023 x 10^23 atoms
We know that n =(the amount of atoms)/(6.023x10^23)
=> n = (1.50x10^21)/(6.023X10^23) =0.00249 (mol)
and m=nxM => M=m/n=0.119/0.00249=47.79
So the atomic mass of the element Z is approximately 47.8
Z is Titanium.
Logged
dipndots
New Member
Posts: 6
Mole Snacks: +0/-0
Re: Atomic mass of an unknown element
«
Reply #6 on:
September 27, 2007, 09:44:04 PM »
I got it. omg thanks. Seems simple when u explained it
Logged
Print
Pages: [
1
]
Go Up
« previous
next »
Sponsored Links
Chemical Forums
Chemistry Forums for Students
High School Chemistry Forum
Atomic mass of an unknown element