Answer: There are [tex]10.5\times 10^{23}[/tex] formula units in 1.75 mol sample of NaCl.
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
1 mole of NaCl contains = [tex]6.023\times 10^{23}[/tex] formula units
Thus 1.75 mol of NaCl contains = [tex]\frac{6.023\times 10^{23}}{1}\times 1.75=10.5\times 10^{23}[/tex] formula units
Thus there are [tex]10.5\times 10^{23}[/tex] formula units in 1.75 mol sample of NaCl.
