Error in TBR?

[SonhosDaVida]

Shouldn't the number I circled be 1.66 miles not 1.67 miles since 0.33 miles were added? Or Is this some proportions thing?

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[AdaptPrep]

You would not be incorrect in saying 1.66 moles. They might have been thinking one-third mole was added each time; so it is adding 0.333333 (repeating) which rounds up to 1.67. However, if it is exactly 0.33 moles (and not one-third mole), then you are correct (1.66 moles). Hopefully, that is an insignificant difference in doing these problems.