How many molecules are in 5 moles of c3h8? show set up and answer

(i feel like i know this, but i'm stuck- the molar mass of c3h8 is 44.1g)

How many electrons does silver have to give up in order to achieve a sido noble gas electron configuration?

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%

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