Question

calculate the mass in milligrams of 10^21 atoms of u-238

Answer 1

calculate the mass in milligrams of:

1) 10^21 atoms of U-238

2) 10^20 molecules of SO2 gas

Answer 2

The weight of one mole of Uranium atoms is 238.03 grams.

One mole equals the Avogadro’s number 6.022×10^23 of molecular entities.

The mass in milligrams of 10^21 atoms of U-238 will be obtained as follows.

Mass of total 10^21 number of atoms of U-238 will be equal to (10^21/6.022×10^23)* 238.03 = 0.39526 grams or 395.26 milligrams.

Every element’s molar mass is distinct and depends on how much 6.022×10^23 numbers of its atoms weigh.