Emp/Molecular ratio

[Cecilia Cisneros 1F]

In a practice problem I was trying to solve for the molecular formula but the ratio of the molar mass between the molecular formula and the empirical formula was not a whole number. What should I do in this instance?

This was the problem:
"After analyzing a sample of lactose there was found to be 42.1% C, 6.46% H, and 51.4% O by mass. What is the molecular formula of lactose if its molar mass is 342.36/mol?"

[Shrey Pawar 2A]

I'm curious too because I tried to solve and for my empirical formula I got C11H22O11 which has a molar mass of approximately 330.29 g/mol. Unless this is a typo I don't think there's a way to find the molecular formula, at least not one we have been taught.

[clairehathaway 2J]

I worked out the problem and got a ratio of about 11.4 which I agree is hard to work with. I believe that at a UA session they said that problems like these on the midterm will likely be very straightforward and you would know if you should round up or down.