What does it mean to say a reactant is present “in excess” in a process? Can the limiting reactant be present in excess? Does the presence of an excess of a reactant affect the mass of products expected for a reaction?

Pure magnesium metal is often found as ribbons and can easily burn in the presence of oxygen. When 4.78 g of magnesium ribbon burns with 7.61 g of oxygen, a bright, white light and a white, powdery product are formed. Enter the balanced chemical equation for this reaction. Be sure to include all physical states. equation: What is the limiting reactant? охудen O magnesium The reaction goes to completion, but in the process of recovering the product, some of it was lost. The the percent yield for the reaction is 82.8%. How many grams of product are recovered? mass of product recovered: How many grams of the excess reactant remain? Assume the reaction goes to completion. mass of excess reactant:

1) Group 1 metals react almost instantly and violently with water, as a single replacement reaction to produce an aqueous solution of metal hydroxide and hydrogen gas. A sample of solid lithium weighing 84.25 mg is dropped into a beaker containing 50.0 mL of water. Assume the density of water is 0.9988 g/mL. a) Write the balanced equation. b) Calculate the theoretical yield (in grams) of lithium hydroxide. c) Assuming the reaction is complete, and that there is no volume change, what is the concentration (in M) of lithium hydroxide in the solution that results?

Use the References to access important values if needed for this question. For the following reaction, 0.127 moles of barium hydroxide are mixed with 0.119 moles of sulfuric acid. barium hydroxide (aq) + sulfuric acid (aq) → barium sulfate(s) + water (l) What is the formula for the limiting reagent? Limiting reagent: What is the maximum amount of barium sulfate that can be produced? Amount = moles

Consider the reaction of solid P, and chlorine gas to form gaseous phosphorus trichloride. a) Write the balanced chemical equation for the reaction. b) The balanced chemical equation is P,(s) + 6 CI,(g) → 4 PCI,(g). What is the mass in grams of phosphorus trichloride that can be formed from 222.3 grams of P, based on the balanced chemical equation? c) The balanced chemical equation is P,(s) + 6 CI,(g) → 4 PCI,(g). What is the mass in grams of phosphorus trichloride that can be formed from 304.8 grams of chlorine gas based on the balanced chemical equation? 28 d) Given that 222.3 grams of P, react to make 985.6 g of PCI, and 304.8 g of CI, react to make 393.5 g of PCI, which reactant is limiting? e) The theoretical yield for the reaction is 393.5 g of PCI,. If only 218.7 g of phosphorus trichloride were collected, what is the percent yield of the reaction?

For the following reaction 36.4 grams of sulfuric acid are allowed to react with 40.1 grams of zinc hydroxide. What is the maximum amount of zinc  sulfate that can be formed? What is the formula for the limiting reagent? What amount of the excess reagent remains after the reaction is complete?

A reaction has a theoretical yield of 76.5 grams of a product, and a percent yield of 41.2  %.  What is the actual yield (in g) of this product in this reaction?

For the reaction Ti(s) + 2 F2 (g) → TIF4(s) compute the theoretical yield of the product (in grams) for each of the following initial amounts of reactants.

Explain the term "limiting reactant". What is an ionic equation? Explain the meaning of "the reaction goes to less than 100% completion".

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