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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