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Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide. In an experiment a 5.00 g sample of calcium oxide reacted with excess water and yielded 6.11 g of the calcium hydroxide. What was the percent yield?

Aspirin, acetyl salicylate, is made by the reaction of acetic anhydride (C4H6O3) with salicylic acid (C7H6O3). The products are aspirin (C9H8O4) and acetic acid (C2H4O2). When 6.05 g acetic anhydride was reacted with 2.24 g salicylic acid, 2.22 g of aspirin was isolated. What is the percent yield for this reaction?

In a certain chemical reaction Compound A combines with Compound B to produce Compound C (and no other products). Measurements were taken of the amounts of A and B present before and after a reaction that produced some C:

1) Calculate the theoretical yield of C. Round your answer to the nearest 0.1g.

2) Suppose the percent yield of C in this reaction was 48.%. Calculate the actual amount of C that was isolated at the end of the reaction. Round your answer to the nearest0.1g.

Gaseous ethane CH3CH3 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 26.2g of ethane and 132.g of oxygen gas? Be sure your answer has the correct number of significant digits in it

Gaseous methane (CH4) 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 0.96g of methane and 3.3g of oxygen gas?  

Round your answer to 2 significant figures

What are the options for above question if my answer is wrong?