Alright alright question for the homies...goth girls

Cucl2 + 2nano3 cu(no3)2 + 2nacl what is the percent yield of nacl if 31.0 g of cucl2 reacts with excess nano3 to produce 21.2 g of nacl? 49.7% 58.4% 63.6% 78.7%

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

Why are people not able to skip a dive to the deepest part of the ocean