Use molar mass of D2O to calculate the density of heavywater

  • Thread starter Thread starter Cory522
  • Start date Start date
  • Tags Tags
    Density Mass
Click For Summary
To calculate the density of heavy water (D2O) from its molar mass, one must compare the number of D2O molecules in a unit volume to that of regular water (H2O). The molar mass of D2O is given as 20.0276 g/mol. The discussion highlights the importance of considering the impact of extra neutrons in D2O on molecular size and interactions compared to H2O. Clarification on the specific calculations needed is requested to ensure accurate understanding. Understanding these differences is crucial for deriving the density of heavy water.
Cory522
Messages
1
Reaction score
0

Homework Statement


how can you go from molar mass to density if its not a gas

Homework Equations


molar mass = 20.0276 g/mol

The Attempt at a Solution


none
 
Physics news on Phys.org
Hi Cory, welcome to PF!

Compare the number of D2O molecules in unit volume to that of water. Do the extra protonsEdit: neutrons change the size and interaction between the molecules appreciably with respect to H2O?
 
Last edited:
ehild said:
Hi Cory, welcome to PF!

Compare the number of D2O molecules in unit volume to that of water. Do the extra protons change the size and interaction between the molecules appreciably with respect to H2O?
It's not extra protons in D2O, it's extra neutrons.
 
Could you please explaing the problem once again, Cory? What exactly needs to be calculated?
 
SteamKing said:
It's not extra protons in D2O, it's extra neutrons.
Of course, a great typo! Thanks. :)
 

Thread 'Magnitude of buoyant force in fluids of different densities'

The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?
View full post »

Similar threads

Calculating Total Internal Energy for a Monatomic Gas at Constant Pressure
  • · Replies 4 ·
Replies
4
Views
2K
Ratio of atomic masses of two ideal gases
  • · Replies 7 ·
Replies
7
Views
1K
Ideal Gas Law and Pressure at 80°C
  • · Replies 2 ·
Replies
2
Views
3K
Calculating Pressure & Density Proportions with Changing Altitude & Temperature
  • · Replies 19 ·
Replies
19
Views
2K
Molar Gibbs Energy: 25{\circ} C Expansion Calculation
  • · Replies 1 ·
Replies
1
Views
2K
Calculate the volume of 1.00 mol of liquid water
  • · Replies 11 ·
Replies
11
Views
4K
Problem regarding vapour density of a mixture
  • · Replies 5 ·
Replies
5
Views
2K
How did Cavendish find the density of the Earth?
  • · Replies 24 ·
Replies
24
Views
2K
Thermodynamics: calculating work question
  • · Replies 6 ·
Replies
6
Views
2K
Density and r.m.s of an ideal gas
  • · Replies 3 ·
Replies
3
Views
2K