How many moles are equal to 89.23g of calcium oxide, cao?

When balancing a chemical equation:

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon