0.15mg = 0.00015g
Na =22g/mol
Cl= 35g/mol
35g/mol + 22g/mol = 57g/mol
0.00015g * 1 mol/ 57 g =2.63 * 10⁻⁶
0.00015g * 1 mol/ 57 g * NA/1mol = 2.63 * 10⁻⁶ NA
2.63 * 10⁻⁶ * 6.02 * 10²³ = 15.8326 * 10¹⁷
Answer:
2.56×10^-6 moles
Explanation:
Number of formula units is the same as the number if moles of NaCl present.
Number of moles= mass/ molar mass
Molar mass of NaCl= (23+35.5)= 58.5gmol-1
Given mass of NaCl= 0.15×10^-3g
Number of moles= 0.15×10^-3/58.5
Number of moles = 2.56×10^-6 moles
