Chemistry 0620 · IGCSE · Relative masses of atoms and molecules

Relative masses of atoms and molecules — practice question

A test-tube contains 12.4 g of copper(II) carbonate, which is then heated. Just 50% breaks down. $[M_r: \text{CuCO}_3 = 124; \text{CuO} = 80]$. What is the final mass of the substances left in the test-tube?

  • A9.4 g
  • B9.8 g
  • C10.2 g
  • D10.6 g

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