Calcium metal reacts with phosphoric acid. What mass of precipitate (in grams) is produced when 40.5 g of calcium reacts with excess phosphoric acid? Hint: Write a balanced chemical reaction first. Do not show your work in the space provided. Record only your final answer with the correct number of significant digits. g Ca3(PO4)2(s)
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- Oxygen masks, used for producing oxygen gas in emergency situations, react potassium superoxide (KO2) with water and carbon dioxide to produce potassium bicarbonate and oxygen gas according to the reaction shown. How many grams of potassium superoxide (KO2) should the mask have if each mask needs to produce 27.6 g of oxygen gas? Your answer should include the correct number of significant figures. Upload a picture or pdf of your work and answer. * 4KO2 + 2 H2O + 4 CO2 -----> 4KHCO3 + 3O2The production of ammonia nia * (N*H_{3}) from nitrogen and hydrogen, shown below, was an important breakthrough resulting in Nobel prizes in chemistry to Fritz Haber (1918) and Carl Bosch (1931). This compound is widely used in manufacturing fertilizers. 3H 2 (g)+N 2 (g) 2NH 3 (g) Calculate the mass of nitrogen (in kg ) needed to manufacture 1000 kg of ammonia . Assume four significant figures .Tetraphosphorus trisulfide, P4S3, is used in the head of wooden matches. This material is manufactured by the hearing of a mixture of red phosphorus with sulfur as shown by the following reaction: _____ P4 (s) + _____S8 (s) --< _____P4S3 (s) Balance the reaction and write the coefficients in order from left to right separated by commas. Example: 1,2,3. Do not place spaces in between the commas.
- Liquid hexane CH3CH24CH3 reacts with gaseous oxygen gas O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O . What is the theoretical yield of water formed from the reaction of 79.3g of hexane and 213. g of oxygen gas? Be sure your answer has the correct number of significant digits in it.MgNH4PO4•6H2O loses H2O in a stepwise fashion as it is heated. Above 100 degrees celsius, the anhydrous material is formed. What is the percentage of phosphorus in the anhydrous material?Enter your answer with 4 significant figuresWhen methane is combusted, how many moles of oxygen gas are needed to react to form 7.90 moles of water? Use the equation below, round to the nearest 0.01, and remember to include units (properly abbreviated) and substance in your answer! CH4 + 2 O2 -> CO2 + 2 H2O
- The unbalanced reaction for the combustion of pentane (C5H12) is: C5H12 + O2 ⟶ CO2 + H2O If the molar mass of pentane is 72 g/mol, how many kilograms of carbon dioxide will be created when 2.80 kilograms of pentane combust? (Give your answer to the second decimal place)Ammonium phosphate NH43PO4 is an important ingredient in many solid fertilizers. It can be made by reacting aqueous phosphoric acid H3PO4 with liquid ammonia. Calculate the moles of ammonium phosphate produced by the reaction of 1.2mol of ammonia. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits. 0.4mol1. A student collected the following data during Lab: Mass of MgCO3 hydrate = 0.9987 g. Constant mass of anhydrous MgCO3 = 0.4831 g How many moles of water were in the MgCO3 hydrate? 2. A student uses gravimetric determination to find the water of hydration of a hydrated sample of cobalt (II) sulfate. The student’s sample contained 0.0098459 moles of anhydrous cobalt(II) sulfate (CoSO4) and 0.068921 moles of water (H2O). What is the formula of the cobalt(II) sulfate hydrate? 3. A student has a sample of CaSO4 hydrate and it weighs 0.4813 grams. He heats it strongly to drive off the water of hydration, and after subsequent heatings, the student finds the anhydrous compound has a constant mass of 0.3750 grams. Find the formula of the hydrate.
- The following chemical equation has NOT been balanced. H3PO4 + Ca(OH)2 --> Ca3(PO4)2 + H2O How many grams of calcium hydroxide are needed to produce 17.94 grams of water in significant figures?Which coefficients correctly balance the following chemical equation? ___ N2 + ___ H2O → ___NH4NO2 a. 1,2,1b. 2,1,1c. 1,1,2d. 1,1,1An ice freezer behind a restaurant has a freon leak, releasing 48.73 g48.73 g of C2H2F3Cl into the air every week. If the leak is not fixed, how many kilograms of fluorine will be released into the air over 6 months? Assume there are 4 weeks in a month. mass of fluorine leaked over 6 months: ?KG