(a)[1]
Which term is defined by the statement below? The average mass of naturally occurring atoms of an element on a scale where the $^{12}\text{C}$ atom has a mass of exactly 12 units.
(b)[2]
Explain why relative molecular mass is suitable for butane but not for potassium fluoride.
(c)[3]
Determine how many moles of element Y are present in 60.0 cm^{3}. Calculate the relative molecular mass of element Y and then suggest the identity of element Y.
(d)[4]
Calculate the empirical formula for this oxide of phosphorus.
(e)[2]
Calculate the mass for one mole of this oxide of phosphorus.