# What is the mass number of oxygen?

Show more Show less

## Answer  Sandra

The mass number of Oxygen is 16amu.

The Weighted Average Atomic Mass for every component is found on the periodic table (That long decimal number close to the base of each case). This number is a mix of all the known Isotopes and essentially discloses to you the normal mass you would expect per particle in the event.

The Mass Number is the mass of a specific particle separately and is estimated in Atomic Mass Units (AMU); these will dependably be entire numbers.

The most widely recognized Isotope is found by adjusting the Weighted normal found on the occasional table to the closest entire number.

The primary researchers to decide relative nuclear masses were John Dalton and Thomas Thomson somewhere in the range of 1803 and 1805 and Jöns Jakob Berzelius somewhere in the range of 1808 and 1826.

Example 1

What is the mass number of sodium?

Solution

The mass number of sodium is 23amu.

Example 2

What is the mass number of calcium?

Solution

The mass number of sodium is chlorine is 35.453amu

### Need homework help now?

Ask your first question for free

Ask question
tutors online

Related Questions
##### 2. (11 marks) a) At 400 °C, ammonium iodide decomposes in the following endothermic reaction: NH41(s) + NH3(g) + HI(g) Kp = 0.215 at 400 °C. Write the equilibrium expression for this reaction. 15.0 g of NH4I was placed in an empty 3.0 L flask and heated to 400 °C. What is the partial pressure of NH3 in the flask once the reaction has reached equilibrium? How would the following changes to the equilibrium mixture affect the number of moles of NH3 in the flask and the value of K, once equilibrium is re-established? (Use increase, decrease or stay the same.) Change Effect on moles of NH3 Ke value Increase temperature Increase volume of flask Remove half of HI gas
Notes
Me

Log In

OR

Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view

OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.

Request Course
Submit