How many oxygen atoms are present in a formula unit of calcium acetate?

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum

When a device is used in a circuit in which the voltage is 81 v the current flowing through the device is 3 a what is the resistance of the device