Answer Happy

5) Hypothetically, if dark matter has negative mass it could be made up of "dark elements" with their own isotopes. If the element Ch has isotopes comprised of -3 AMU (24%). -5 AMU (57%) and -9 AMU (19%), what would the average atomic mass be in AMU? (4 pts) *-5.67 AMU b-5.28 AMU -1.76 AMU 5.28 AMU 5.67 AMU Silicon carbide (SiC) is made thorough the reaction of SiO, and carbon shown below. When 100. kg of SiC is reacted with excess carbon, 51.4 kg of SiC is produced. What is the % yield? (4 pts) a. 51% b. 90% c. 77% d. 86% c. 44% Sio, +3C Sic +3 CO Which statement correctly describes the protons when you balance the following redox reaction in acidic conditions? (4 pts) Cr3+ + C,H,OH+Cr,0,2 C,H,O, 28 H+ on the reactant side. 16 H+ on the reactant side. 28 H+ on the product side. 16 H+ on the product side. a. 0.250 M b. 0.275 M c. 0.263M d. 0.825 M c. 0.750M What is the total ion concentration after the following events? A 250 mL of 0.500 M Na.SO, is diluted to 500. ml. 25.0 ml of water from this solution evaporates. 25.0 ml of the original 250 ml 0.500 M solution is then added to make the final volume 500 ml. (4 pts)