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Conversions. SHOW YOUR WORK! You will be graded on correct units and setup as well as the final answer. Note: for molar mass,

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Answer #1

1)

use:

number of molecules = number of mol * Avogadro’s number

number of molecules = 2.67 * 6.022*10^23 molecules

number of molecules = 1.608*10^24 molecules

Answer: 1.61*10^24 molecules

2)

molar mass of Ca = 40.08 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 = 40.08/(6.022*10^23)

mass of 1 atom = 6.656*10^-23 g

mass of 9.57*10^22 atom = mass of 1 atom * total number of atoms

mass of 9.57*10^22 atom = 6.656*10^-23 * 9.57*10^22

mass of 9.57*10^22 atom = 6.369 g

Answer: 6.37 g

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