What is the correct formula for the compound formed between magnesium and the phosphate ion?

Will mark brainliest26. which of these statements are true? (3 points)a. gases are compressibleb. gases fill their containers completelyc. the pressure of a gas is independent of the temperatured. gases have masse. gases exert pressuref. the pressure of a gas is dependent on the volumeg. gas pressure results from the collisions between gas particlesh. gases have a definite volume and shape

Why does his teacher ask him to balance the equation by including the correct coefficient

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same