Through stoichiometric calculations, the theoretical yield of indigo was calculated to be 1.70 g. However, when massed after the experiment, only 0.73 g of indigo had been produced.

What is the percent yield of indigo?

A) 97.0%
B) 232.8%
C) 57.1%
D) 42.9%

                     %age Yield  =  42.9 %

Explanation:

Percentage Yield is defined as the actual yield divided by theoretical yield. It is given as,

                   %age Yield  =  Actual Yield / Theoretical Yield × 100 --- (1)

Also,

         Actual Yield is the amount of desired product which is obtained after an experiment is completed. We can also call it the real yield which is obtained practically. While, theoretical yield is the yield which is calculated on paper. Hence, we can say that the actual yield is always less than theoretical yield due to many reasons including reaction conditions and researcher handling problems.

Thus we are given following data;

                   Theoretical Yield  =  1.70 g

                   Actual Yield  =  0.73 g

Putting these values in Eq. 1,

                   %age Yield  =  0.73 g / 1.70 g × 100

                   %age Yield  =  42.9 %

- 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