Question

I have no idea how to do this

Uranium has an atomic weight of 238 amu.

Weight of one mole of uranium = _____g/mol

Weight of one mole of oxygen = 16.00 g

The molar mass or molecular weight for U205 is ____g/mol.

Answer 1

Molecular mass U2O5 = 556 g/mol

Step-by-step explanation:

The atomic mass of an element expressed in amu (atomic mass units) is equal to the weight in grams of 1 mole of the corresponding element

i.e. amu = g/mole

The atomic weight of Uranium = 238 amu

Therefore, weight of 1 mole of Uranium = 238 g/mol

Weight of 1 mole of O = 16.00 g

`Molecular mass of U2O5 = 2(atomic weight of U) + 5(atomic weight of O)`

`Molecular mass of U2O5 = 2(238g/mol) + 5(16 g/mol) = 556 g/mol`

Answer 2

It is known that amu is equal to the molar mass of 1 mole of substance. Therefore,

Weight of one mole of uranium = 238 g/mol


The molar mass or molecular weight for U205 is 556 g/mol.
(238 x 2) + (16 x 5) = 556 g/mol