If the element `X` consists of `78.7%` of atom with a mass of `24.0` amu,`10.1%` of atoms with a mass of `25.0` amu and `11.2%` of atom with a mass of `26.0` amu, what is the atomic weight of `X`?

What is atomic mass unit (amu)?

1 amu = (1)/(12) the mass of one C-12 atom .

If the mass of 0.25 moles of an element Xis 2.25g, the mass of one atom of X is about:

Tritium is the .^(3)H isotope of hydrogen. Its atomic mass is 3.016amu: the atomic mass of .^(1)H is 1.0078 amu, and that for the neutron is 1.00867 amu. What do you predict about the stability of tritium? Repeat for .^(2)H , deuterium, which has an atomic mass of 2.0141 amu.

How many atoms are there in 100 amu of helium , if atomic mass of helium is 4 amu ?

1 amu ( atomic mass unit ) mass is equal to energy of

One atom mass unit (amu) is equivalent to

Assertion (A) : A single .^(12)C atom has mass exactly 12 amu and a mole of these atoms has a mass of exactly 12 gram. Reason (R) : A mole of atoms of any element has a mass in gram equal to the atomic mass of the element.