What is the mass of the oxygen in one mole of calcium phosphate

What is the number of moles in 15.0 g ash3?

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

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.