my theoretical yield of beryllium chloride was 10.7 grams. If my actual yield was 4.5 grams, what is the percent yield​

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u.s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?