How many atoms are represented by the formula CaO2?

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

The atoms of a solid aluminum can are close together, vibrating in a rigid structure. if the can is warmed up on a hot plate, what happens to the atoms?

What sources of error may have contributed to the percent yield not being 100 percent? think about things that may have led to inaccurate measurements or where mass of the product could have been lost if this experiment was conducted in a physical laboratory.