Show transcribed image text .oooo AT&T令 7:51 PM Done 121 Exam#1(SF'2017)(P.TJsample.d How many grams and molecules of hydrogen gas are needed to produce 6.50 grams of steam (water)?. The synthesis of steam results from the reaction of hydrogen gas and oxygen gas. Solid Potassium perchlorate decomposes into solid potassium chloride and oxygen gas. How many grams of oxygen is produced when 3.50 x 102 Kg of potassium perchlorate is decomposed? Calculate the grams of barium sulfate produced if 5.0 grams of barium chloride is mixed with 4.0 grams of magnesium sulfate. How much excess reagent remains? How would you prepare 400.0 mL of a 0.500M HCI solution from a stock bottle of 12.0M HCI? Do the math, sketch a picture and write a statement. Calculate the mL of 0.250 M sodium hydroxide needed to neutralize 25.00 mL of 0.250 M nitric acid. Combustion of 19.81 mg of an industrial acid produces 41.98 mg CO and 6.45 mg H,O. If 0.250 mol of the acid has a mass of 41.5 g, determine the empirical and molecular formula of the acid. Write the balanced equation for the following reactions Hydrochloric acid and sodium hydroxide mixing Potassium hydroxide and Acetic acid are mixed 个