Go Back   Science Forums Biology Forum Molecular Biology Forum Physics Chemistry Forum > General Science Forums > Chemistry Forum
Register Search Today's Posts Mark Forums Read

Chemistry Forum Chemistry Forum. Discuss chemical reactions, chemistry.


New to chemistry, please teach me the calculation!!

New to chemistry, please teach me the calculation!! - Chemistry Forum

New to chemistry, please teach me the calculation!! - Chemistry Forum. Discuss chemical reactions, chemistry.


Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 02-01-2004, 09:01 PM
chemistrynut
Guest
 
Posts: n/a
Default New to chemistry, please teach me the calculation!!



i've 2 questions that i don't know how to do, looking through my
textbook for hours still i couldn't get the answers they provided.
Can anyone please show me how to do them with the work shown?

Here are the questions.

1)The important metal titanium has five naturally occuring isotopes on
Earth. However, the percentages and isotope distribution could vary
if titanium were found elsewhere. For example, hypothetically we
could analyze a sample from the moon and find the following: Two
titanium isotopes were found; one with a mass of 47.9479 amu and a
percent abundance of 81.533. If the weighted atomic mass of the
titanium in this sample was 47.5268 what would be the mass (in amu)
of the second isotope? How many significant figures should the answer
have? Enter your answer as an integer.

correct answer: 45.668 amu 2.0%
5 significant figures

2)The anti-tumor agent cisplatin is 65.0% platinum. How many grams
(use g for the unit) of cisplatin could be synthesized with 1.22 mg
of platinum? How many significant figures should the answer have?
Enter your answer as an integer.

correct answer: 0.00187 g 2.0%
3 significant figures.

please teach me, I know they are easy for you guys, but i'm totally
new to chemistry and need to know the way to do them. I need to
practise more for my coming up exam, so please show me the
calculation of solving the problems, I really appreciate you.
Thanks!!!



----== Posted via Newsfeed.Com - Unlimited-Uncensored-Secure Usenet News==----
[Only registered users see links. ] The #1 Newsgroup Service in the World! >100,000 Newsgroups
---= 19 East/West-Coast Specialized Servers - Total Privacy via Encryption =---
Reply With Quote
Reply

Tags
calculation , chemistry , teach


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Turned off science SKS Physics Forum 10 06-20-2005 08:37 AM
Sci.chem FAQ - Part 7 of 7 Bruce Hamilton Chemistry Forum 0 01-15-2004 09:13 AM
Sci.chem FAQ - Part 3 of 7 Bruce Hamilton Chemistry Forum 0 01-15-2004 09:10 AM
Sci.chem FAQ - Part 2 of 7 Bruce Hamilton Chemistry Forum 0 01-15-2004 09:07 AM
Sci.chem FAQ - Part 1 of 7 Bruce Hamilton Chemistry Forum 0 01-15-2004 09:06 AM


All times are GMT. The time now is 03:40 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 2005 - 2012 Molecular Station | All Rights Reserved
Page generated in 0.14316 seconds with 16 queries