Question

A cube of tin that is 112 mm on each side has a mass of 8.21 grams. A single tin atom has a mass of 118.7 amu. How many tin atoms are in the cube? Report your answer in scientific notation with 3 sig figs. Use e for scientific notation, for example 100. would be written as 1.00e+2

Answer 1

Answer:

4.17e+22 atoms of tin are present in the cube

Explanation:

We don't require the size of the cube. With the mass and the molar mass of tin = 118.7 amu we can find moles of Tin. As 1 mol = 6.022x10²³ atoms we can find the number of atoms:

Moles Tin:

8.21g * (1mol / 118.7g) = 0.0692 moles Tin

Atoms Tin:

0.0692 moles Tin * (6.022x10²³ atoms / mol) =

4.17e+22 atoms of tin are present in the cube