Answer: 2.14 x 10^24 molecules
Step-by-step explanation:
Based on Avogadro's law:
1 mole of any substance has 6.02 x 10^23 atoms
So, 1 mole of ammonium sulphate = 6.02 x 10^23 molecules
3.55 moles of Aluminum Sulphate = Z molecules
To get the value of Z, cross multiply:
Z molecules x 1 mole = (6.02 x 10^23 molecules x 3.55 moles)
Z = 21.37 x 10^23 molecules
Z = 2.137 x 10^24 molecules (to 3 decimal place)
Rounded to nearest hundredth Z becomes 2.14 x 10^24
Thus, there are 2.14 x 10^24 molecules in 3.55 miles of Aluminum Sulphate.