May 31, 2023, 12:48:54 AM
Forum Rules: Read This Before Posting

### Topic: A rock  (Read 12798 times)

0 Members and 1 Guest are viewing this topic.

#### typhoon2028

• Full Member
• Posts: 251
• Mole Snacks: +18/-12
##### Re: A rock
« Reply #15 on: August 26, 2010, 02:55:20 PM »
An object placed in water will displace a volume of water equal to the volume of the object.

This is correct:
17-11.3=5.7 ml

1 ml = 1cm³

12.1g/5.7cm³ = 2.12g/cm³

The way you want to do it would give you a rock with a density lower than water.  I don't see many floating rocks!

#### Borek

• Mr. pH
• Deity Member
• Posts: 27355
• Mole Snacks: +1776/-408
• Gender:
• I am known to be occasionally wrong.
##### Re: A rock
« Reply #16 on: August 26, 2010, 05:04:39 PM »
12.1g/5.7cm³ = 2.12g/cm³

12.1g/5.7cm³ = 2.12g/cm³

What it is with you people, is it so hard to read forum rules? We don't give exact answers.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

#### JGK

• Chemist
• Full Member
• Posts: 738
• Mole Snacks: +66/-19
• Gender:
##### Re: A rock
« Reply #17 on: August 26, 2010, 05:20:41 PM »
12.1g/5.7cm³ = 2.12g/cm³

12.1g/5.7cm³ = 2.12g/cm³

What it is with you people, is it so hard to read forum rules? We don't give exact answers.

Probably down to frustration BoreK; the OP seems to  have a rock like density and is incapable of recognizng help when given. Even spoon feeding the correct answer once didn't seem to take.
Experience is something you don't get until just after you need it.

#### typhoon2028

• Full Member
• Posts: 251
• Mole Snacks: +18/-12
##### Re: A rock
« Reply #18 on: August 27, 2010, 10:21:01 AM »

My point was the poster should have logically figured out his density answer was incorrect.

#### typhoon2028

• Full Member
• Posts: 251
• Mole Snacks: +18/-12
##### Re: A rock
« Reply #19 on: August 27, 2010, 10:23:58 AM »
Also, not to be technical about rules, but I do not believe the answer is exact.  I believe the significant digits in the answer I posted are incorrect.

#### 408

• Chemist
• Full Member
• Posts: 796
• Mole Snacks: +103/-30
##### Re: A rock
« Reply #20 on: August 27, 2010, 04:38:27 PM »
the OP seems to  have a rock like density

d=m/v

mass-you have
volume- of the rock, which is equal to that of the water displaced.