Set 1 – Ar & Mr

Calculate the relative molecular mass (formula mass) of copper (II) sulfate pentahydrate CuSO₄ ●5H₂O

Calculate the relative molecular mass (formula mass) of iron (III) bromide, FeBr₃

Calculate the relative molecular mass (formula mass) of lithium carbonate, Li₂CO₃

Calculate the relative molecular mass (formula mass) of silver sulphate, Ag₂SO₄

Calculate the relative molecular mass (formula mass) of calcium nitrate, Ca(NO₃)₂

Calculate the relative molecular mass (formula mass) of nitrogen dioxide, NO₂

Calculate the relative molecular mass (formula mass) of zinc hydroxide, Zn(OH)₂

Calculate the relative molecular mass (formula mass) of sodium iodide, Nal

Calculate the relative molecular mass (formula mass) of ethene C₂H₄

Calculate the relative atomic mass (to one decimal place) of element, C if element C is a mixture of two isotopes, ⁸⁵C and ⁸⁷C, with the abundances 72.15% and 27.85% respectively.

Calculate the relative atomic mass (to one decimal place) of element, B if element B is a mixture of two isotopes, ¹⁰B and ¹¹B. There is one atom of ¹⁰B to every four atoms of ¹¹B.

Calculate the relative atomic mass (to one decimal place) of element, A, if element A is an almost equal mixture of two isotopes, ⁷⁹A and ⁸¹A.

How many carbon-12 atoms would have the same mass as 6 Br atoms? Enter a whole number.

How many carbon-12 atoms would have the same mass as 3 Si atoms? Enter a whole number.

How many carbon-12 atoms would have the same mass as 1 Ag atom? Enter a whole number.

Neon (accurate relative atomic mass = 20.18) is made up of three isotopes: Ne-20, Ne-21 and Ne-22.

One of these makes up 90.92% of the element. Which one?

Identify the element (write the symbol) if an atom of Z is one-third of the mass of a ¹²C atom.

Identify the element (write the symbol) if an atom of Y is twice as heavy as an atom of carbon-12.

The atomic mass of an element is:

Identify the element (write the symbol) if an atom of X is four times as heavy as an atom of carbon-12.