Question

How many H atoms are in 92.5g of isopropanol (rubbing alcohol),
C_{3}H_{8}O? Enter your answer in scientific
notation.

Answer #1

**Answer** – We are given, mass of isopropanol
(C_{3}H_{8}O) = 92.5 g

Moles of isopropanol (C_{3}H_{8}O) = 92.5
g/60.095 g.mol^{-1}

= 1.54 moles

We know,

1 moles of C_{3}H_{8}O = 8 moles of H

So, 1.54 moles of C_{3}H_{8}O = ?

= 12.31 moles of H

Now mole to atoms

1 moles of H = 6.023*10^{23} atoms

So, 12.31 moles of H = ?

**= 7.42*10 ^{24} atoms of H**

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