Product Yield

[cmF]

I came across this question in qVault and can't understand why it's not B.

In organic chemistry lab, my actual yield would always be under or over the theoretical yield, thus being either under or over 100%.

The explanation I always gave in my lab reports is that the product was either contaminated with other compounds or wet/needed drying in an evaporating dish or something. Am I missing something here? Thanks!

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[hurley]

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[cmF]

It might help if you read the question as "which statement is MOST false?"

It is definitely possible to determine yield percentages to the tenths place, so (A) is very false.
It is impossible to have yields over 100% (answer C reminds you of this), therefore if your calculated yield is over 100%, you have either made a mistake in your calculation (D), the balance is not calibrated and is giving you false values (E) or the product has not dried completely and the added hydrate is giving you a falsely high mass (B).

Everything else but A might lead to a calculated yield over 100%.

My reading comprehension!!! Thanks!