Question

I need all the numbers to be converted to mL/g , mL , or g having all the answere round to 3 significant figures and not to have any ul, mg or ul/mg.

Thanks!

mMol benzaldehyde: (80 µl x 1.044mg/1µL)x (1mMol/106.121 mg ) = 0.79 mMoL benzaldehyde.

mMol of acetone = 29 µl X (0.79 mg / 1mL) X (1mMol/ 58.08 mg) = 0.39 mMol acetone

Limiting reagent:

0.79 mMol benzaldehyde X (1 mMol of dibenzalacetone /2 mMol benzaldehyde) = 0.40 mMols dibenzalacetone

0.39 mMol acetone X (1 mMol of dibenzalacetone /1 mMol acetone) = 0.39 mMols dibenzalacetone

Limiting reagent is acetone.

Theoretical yield: 0.39 mMol acetone X (1 mMol of dibenzalacetone /1 mMol acetone)(234.29 mg/ 1 mMol) = 91.37 mg dibenzalacetone

Percent yield: ( 0.0323g of dibenzalacetone) x (1000 mg/ 1 g) = 32.30 mg of dibenzalacetone

(32.30 mg /91.37 mg) x 100% = 35 %

Answer 1

Before we convert the units, we can write down the conversion formula required.

Hence,

mMol of Benzaldehyde =

Now solving the math and rounding to 3 significant figure and recalculating gives us

mMol of Benzaldehyde =

mMol of acetone =

note: I believe you have wrongly written ml instead of ul for the acetone equation so I have corrected it.

Now solving the math and rounding to 3 significant figure and recalculating gives us

mMol of acetone =

Next we have

Note: Important thing to note here is that, after rounding to three significan figure, the limiting reagent is changing.

Now, benzaldehyde is the limiting reagent.

Theoretical yield=

Percent Yield=

Hence, the percent yield is 35.2%.