Consider the Diels–Alder cycloaddition of anthracene with maleic anhydride under mild conditions. Reaction scheme showing the Diels-Alder reaction of maleic anhydride and anthracene. A reaction was performed in which 0.42 g of anthracene (178.23 g/mol) was reacted with a slight excess of maleic anhydride (98.06 g/mol) to make 0.2 g of Diels-Alder product (276.29 g/mol). Calculate the theoretical yield and percent yield for this reaction.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante