Compared to 3.011 × 10²³ atoms of Na, 1.0 mole of Carbon A. has the same number of atoms
B. has twice as many atoms
C. not enough information
D. has half as many atoms
Compared to 1.0 mole of H₂S (molar mass 334 g/mol), 1.0 mole of NH₃ (molar mass 17g/mol)
A. has half the number of molecules
B. not enough information
C. has twice the number of molecules
D. has the same number of molecules
Thank you!

1. B. has twice as many atoms

2. D. has the same number of molecules

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

1.

3.011 × 10²³ atoms of Na, 1.0 mole of Carbon

1 mole Carbon =  6.02.10²³ atoms, so 1 mole of Carbon B. has twice as many atoms of Na

2.

1.0 mole of H₂S (molar mass 334 g/mol), 1.0 mole of NH₃ (molar mass 17g/mol)

Both have the same number of moles, so they have the same number of molecules

1.0 mole of NH₃ D. has the same number of molecules as  1.0 mole of H₂S