Mercury(ii) oxide (hgo) decomposes to form mercury (hg) and oxygen (o2). the balanced chemical equation is shown below.2hgo    2hg + o2the molar mass of hgo is 216.59 g/mol. the molar mass of o2  is 32.00 g/mol. how many moles of hgo are needed to produce 250.0 g of o2?

i'm assuming that the correct answer is indeed the first one/ "a"..

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?