Question

Part A

How many carbon atoms are there in a 1.3-carat diamond? Diamonds are a form of pure carbon. (1 carat = 0.20 grams)

Express your answer to two significant figures.

carbon atoms =

Part B

Calculate the mass of 2.25

Answer 1

part a

If 1 carat = 0.20g
then 0.3 carat = 0.20 / 0.3 = 0.06g
Thus, 1.3 carat = 0.26g
Find the Mm of Carbon on the periodic table,
C = 12.011g/mol
Find the moles first:
Moles = Grams / Mm of C
0.26 / 12.011 = 0.0216mols of C
Atoms = Moles * Avogadro's number (6.022*10^23)
0.0216 * 6.022*10^23 = 1.3*10^22 C atoms

part b
Reverse the calculation from the previous calculation:
2.25*10^22 / 6.022*10^23 = 0.0374mols of W (Tungsten)
Find Mm of Tungsten(W) on the periodic table:
W = 183.85g/mol
0.0374*183.85 = 6.87g

Answer 2

Answer 3

Express your answer to two significant figures.

carbon atoms =

86

Part B

Calculate the mass of 2.25