Find the value of c with the correct number of significant figures from the equation a - b - C = 401, if a = 1387.11 and b = 928.321.
57
57.789
57.8
57.9
58
58.789

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

How many moles of al3+ ions are in 1.25 moles of al2o3

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?