A student working in the laboratory produces 6.81 grams of calcium oxide, Cao, from 20.7 grams of calcium carbonate, CaCO3, according to the reaction CaCO3 + CaO + CO2. Calculate the theoretical yield and
the percent yield for the reaction. Show and/or explain your work.

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.

How many moles of oxygen react with 12 moles of aluminum