Chem questions: In the procedure of the Diels-AkJer reaction you will perform, t

Question

Chem questions:

In the procedure of the Diels-AkJer reaction you will perform, the first step will be to weigh out maleic anhydride. You will then have to calculate how much 2,3-dimethylbutadiene you will need.Assuming you weigh out 192 mg of maleic anhydride, how many moles does that correspond to? (Use five digits after the decimal point)(assume C - 12.0, H = 1.0, O - 16.0)In this Diels-Alder reaction you will be using equivalent amounts of maleic anhydride and 2,3-dimethylbutadiene. You weighed out 210 mg of maleic anhydride. Which volume of 2,3-dimethylbutadiene will you need to add? The answer should be in mL with three digits after the decimal point.

Explanation / Answer

maleci ananhydride = C4H2O3   

hence its mol wt = ( 4 x 12) + 2(1) + ( 3 x 16) = 98 gm/mol

hence 192 mg maleiic anahydride moles = ( 192 x 10^-3 /98) = 0.00196

( here mass taken in gm hence 10^-3 multiplied to mg)

2) MOLES OF maleic anahydride = ( 210 x 10^-3/98) = 0.00214

hence moles of 2,3 dimethyl butadiene = 0.00214

mass of 2, 3 dimethyl butadiene = 0.00214 x82 = 0.1755 ( 82 gm/mol is mol wt of 2,3 dimethyl butadiene)

density of 2,3 dimethyl butadiene = 0.722 gm/cc

hence vol of 2,3 dimethyl butadiene = mass/density = ( 0.1755/0.722 = 0.243 ml

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