A student heats calcium carbonate to produce calcium oxide, according to the following equation: CaCO3 (s) ➔ CaO (s) + CO2 (g)
If the student starts with 100.0 grams of CaCO3 and makes 45.0 g of CaO, what is his percent yield?

Do not understand this at all

Which of the following compounds does not contain molecules? question 2 options: co2 h2 nacl h2o

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

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?