Question

There are __________ hydrogen atoms in 4.15 × 10-23 moles of C4H4S2.

Answer 1

Solution:

$\nu(H)=4\times\nu(C_4H_4S_2)=4\times4.15\times10^{-23}\,mol=16.6\times10^{-23}\,mol$

$N(H)=\nu(H)\times N_A=16.6\times10^{-23}\,mol\,\,\times6.02\times10^{23}{mol^{-1}}\approx100$

Answer:

100 atoms