Question

Diamond is one of several naturally occurring forms of carbon. one carat is defined to be exactly 0.200 grams. how many atoms of carbon are in a 0.75 carat diamond? use "e" for scientific notation

Answer 1

Answer:

                   7.52E21    (or)   7.52 × 10²¹ C atoms

Solution:

Data Given:

                 Mass of Diamond  =  0.2 × 0.75  =  0.15 g

                 M.Mass of Diamond  =  12.01 g.mol⁻¹ (as it is purely Carbon)

Step 1: Calculate Moles of Diamond as,

                 Moles  =  Mass ÷ M.Mass

Putting values,

                 Moles  =  0.15 g ÷ 12.01 g.mol⁻¹

                 Moles  =  0.0125 mol

Step 2: Calculate number of Carbon atoms,

As 1 mole of any substance contains 6.022 × 10²³ particles (Avogadro's Number) then the relation for Moles and Number of Carbon atoms can be written as,

                 Moles  =  Number of C Atoms ÷ 6.022 × 10²³ Atoms.mol⁻¹

Solving for Number of C atoms,

                 Number of C atoms  =  Moles × 6.022 × 10²³ Atoms.mol⁻¹

Putting value of moles,

                 Number of C atoms  =  0.0125 mol × 6.022 × 10²³ Atoms.mol⁻¹

                 Number of C atoms  =  7.52 × 10²¹ C atoms