1.

The mass of a single barium atom is 2.28×10-22 grams. How many barium atoms would there be in 306 milligrams of barium?

Answer»

Given:

MASS of single barium atom = 2.28×10⁻²² grams

Mass of barium = 306 MILLIGRAMS = 0.396 grams

To FIND:

Number of ATOMS in 306 milligrams of barium

Calculation:

We know the formula

Number of atoms = Total mass / Mass of single atom

                             = 0.306 / 2.28×10⁻²²

                             = 0.134×10²²

                             = 13.4×10²⁰ atoms

Number of atoms in 306 milligrams of barium is 13.4×10²⁰ atoms



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