An oxide of an element, X, has the formula X2O3 The relative formula mass of X2O3 is 160.
Calculate the relative atomic mass of element X

4- c, because all matter stays the same no matter what. it is still there. 5- b, because matter is known as mass. 6-c because, flammability is a chemical property. malleability is changing the shape of an object.

Solubility would be your answer.

Answer; carbon monoxide (co);