Question

If it takes three "breaths" to blow up a balloon to 1.2 , and each breath supplies the balloon with 0.060 moles of exhaled air, how many moles of air are in a 3.0 balloon.

Express your answer in moles using two significant figures

Would the answer be 0.38 mol?

Answer 1

Is it 1.2 L and 3.0 L ? If so,
1.2 L / 3 breaths = 0.4 L / breath
(3.00 L) / (0.4 L / breath) = 7.5 breaths
(7.5 breaths)(0.060 mol/breath) = 0.45moles

Answer 2

we have 1.2 L and 3.0 L
therefore
1.2 L / 3 breaths = 0.4 L / breath
(3.00 L) / (0.4 L / breath) = 7.5 breaths
(7.5 breaths)(0.060 mol/breath) = 0.45moles