What are the number of moles of CO2 which contains 16 g of oxygen?

What are the number of moles of CO2 which contains 16 g of oxygen?

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1) The metal that is used as a catalyst in the hydrogenation of oils is

2) The metal that is usually extracted from sea water is

3) The metal does not give H₂ on treatment with dilute HCL is

4) The items amenable to detection by soft x-rays are

5) The luster of a metal is due to