Expressing concentrations as a percent

In summary, the concentration of O2 in seawater is 0.01%. The Earth's atmosphere contains 21% O2/L of air, which is significantly higher than the concentration in seawater.
  • #1
Illyaria
3
0
Please post this type of questions in HW section using the template and showing your work.
You measure the concentration of O2 in seawater to be 5.0 mg O2/L H2O. Express this concentration as a percent.

Question 2: The Earth's atmosphere contains 21% O2/L of air. How much more oxygen does the atmosphere hold than seawater from the previous question?

So for question one I got 0.01% which I think is way off. For question 2, I was just going to subtract 21% from the answer from 1. I changed the milligrams to grams for question one.
 
Physics news on Phys.org
  • #2
What was your attempt to solve #1?
 
  • #3
Comeback City said:
What was your attempt to solve #1?

I converted the 1 5.0 mg to grams and got 0.005g. Then, I divided that by 50 which is the atomic msss for O2/L H2O I think and multiplied that by 100.
 
  • #4
Atomic mass of Oxygen is 16.00 amu, so O2 would be 32.00. Why did you divide by it though and then multiply by 100?
 

What does it mean to express concentrations as a percent?

Expressing concentrations as a percent is a way of representing the amount of a particular substance in a solution relative to the total amount of the solution. It is typically expressed as a percentage, with the numerator being the amount of the substance and the denominator being the total amount of the solution.

What is the formula for calculating percent concentration?

The formula for calculating percent concentration is: (amount of substance / total amount of solution) x 100%. This will give you the percentage of the substance in the solution.

How is percent concentration different from molarity?

Percent concentration and molarity are two different ways of expressing the concentration of a solution. Percent concentration is based on the percentage of a particular substance in the solution, while molarity takes into account the molecular weight of the substance and the volume of the solution.

Can percent concentration be greater than 100%?

Yes, percent concentration can be greater than 100%. This would mean that there is more of the substance in the solution than the total amount of the solution itself.

How is percent concentration used in real life?

Percent concentration is commonly used in fields such as chemistry, biology, and medicine to express the amount of a particular substance in a solution. It is also used in everyday life, such as when reading nutrition labels on food products to determine the percentage of certain ingredients.

Similar threads

Automotive Loss of gaseous volume because of fuel combustion
    • Mechanical Engineering
Replies
2
Views
174
Finding concentration of a sample
    • Biology and Chemistry Homework Help
Replies
5
Views
1K
Percent Change in Concentration
    • Biology and Chemistry Homework Help
Replies
6
Views
6K
Analyzing Oxygen Ratios in Magnesium Oxide Lab Reactions
    • Biology and Chemistry Homework Help
Replies
10
Views
16K
Given percent composition, find mass per litre of solution
    • Biology and Chemistry Homework Help
Replies
6
Views
2K
Explaining The Non-Reaction Of An Iron Nail With Equilibrium
    • Biology and Chemistry Homework Help
Replies
7
Views
2K
Decomposition of N2O5: Reaction Mechanisms and Intermediate Concentrations
    • Biology and Chemistry Homework Help
Replies
1
Views
3K
Question Related To Volume Strength Of H2O2.
    • Biology and Chemistry Homework Help
Replies
3
Views
6K
[Kinetics] Using Rate as a Conversion Factor
    • Biology and Chemistry Homework Help
Replies
4
Views
2K
Questions about the common-ion effect
    • Chemistry
Replies
4
Views
796

Hot Threads

Recent Insights

Back
Top