Question

How many H atoms are in 92.5g of isopropanol (rubbing alcohol), C₃H₈O? Enter your answer in scientific notation.

Answer 1

Answer – We are given, mass of isopropanol (C₃H₈O) = 92.5 g

Moles of isopropanol (C₃H₈O) = 92.5 g/60.095 g.mol^-1

                                                   = 1.54 moles

We know,

1 moles of C₃H₈O = 8 moles of H

So, 1.54 moles of C₃H₈O = ?

= 12.31 moles of H

Now mole to atoms

1 moles of H = 6.023*10²³ atoms

So, 12.31 moles of H = ?

= 7.42*10²⁴ atoms of H