8.4 Mole Calculations II 13. What is the mass of 4.50 x 1022 atoms of gold, Au? (a) 0.0679 g (b) 0.0748 g (c) 13.3 g...

Question

Question

8.4 Mole Calculations II 13. What is the mass of 4.50 x 1022 atoms of gold, Au? (a) 0.0679 g (b) 0.0748 g (c) 13.3 g (d) 14.7

Answer 1

Answer #1

molar mass of Au = 197.0 g/mol

This is mass of 6.022*10^23 atoms

use:

mass of 1 atom = molar mass /(6.022*10^23)

mass of 1 atom = 197.0/(6.022*10^23)

mass of 1 atom = 3.271*10^-22 g

mass of 4.5*10^22 atom = mass of 1 atom * total number of atoms

mass of 4.5*10^22 atom = 3.271*10^-22 * 4.5*10^22

mass of 4.5*10^22 atom = 14.7 g

Answer: d

Answer 2

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