Q] What is the difference between mass number & atomic mass ?
Asked by Prahnesh | 25th Jun, 2016, 07:05: PM
Expert Answer:
"Mass number" is simply the total number of nuclear particles (protons plus neutrons).
"Atomic mass" is the actual mass of the atom.
Remember that protons and neutrons do not have masses of exactly one amu.
Even if they did, the mass of the nucleus is not the sum of the masses of the nuclear particles.
There is only one isotope of one element that is carbon for which the mass number and atomic mass are exactly the same. That is carbon-12. It is because the amu is defined as 1/12 of the mass of a carbon-12 atom.
"Mass number" is simply the total number of nuclear particles (protons plus neutrons).
"Atomic mass" is the actual mass of the atom.
Remember that protons and neutrons do not have masses of exactly one amu.
Even if they did, the mass of the nucleus is not the sum of the masses of the nuclear particles.
There is only one isotope of one element that is carbon for which the mass number and atomic mass are exactly the same. That is carbon-12. It is because the amu is defined as 1/12 of the mass of a carbon-12 atom.
Answered by Prachi Sawant | 27th Jun, 2016, 11:30: AM
Related Videos
- what is mole
- In a reaction of magnesium with HCl if 2.24 litre of H2 is obtained at STP the mass of the other product will be what
- 5g of marble was added to 100 c.c of 0.2 M HCl. What volume of CO2 measured at STP will be evolved in the above reaction
- an organic compound an analysis : c=65%, h=3.5% n = 9.6% and o= 21.9% 0.3675 gm of
the
- give answer
- jkk
- The hydrated salt na2so4 nh20 under goes 55% loss in weight on heating and become anhydrous.the value of small n? will
- 25ml of a solution containing HCl was treated with excess of M/5 KIO3 and KI solution of unknown concentration where I2 liberated is titrated against a standard solution of 0.021M Na2S2O3 solution whose 24ml were used up. Find the strength of HCl and volume of KIO3 solution consumed.
- carbon react with chlorine to form ccl4 .36gm of carbon was mixed with 142gmof ccl2.calculate mass of ccl4 produce and remaining mass of reactant
- Phosphorus pentachloride decomposes according to this equation. PCl5(g) equilibrium reaction arrow PCl3(g) + Cl2(g) An equilibrium mixture in a 5.00 L flask at 245°C contains 4.27 g of PCl5, 9.31 g of PCl3, and 2.86 g of Cl2. How many grams of each will be found if the mixture is transferred into a 2.00 L flask at the same temperature.
Kindly Sign up for a personalised experience
- Ask Study Doubts
- Sample Papers
- Past Year Papers
- Textbook Solutions
Sign Up
Verify mobile number
Enter the OTP sent to your number
Change