Cobalt(II) chloride reacts with fluorine in a single replacement reaction to produce cobalt(II) fluoride and chlorine gas.
Balanced Equation: 1 CoCl2 + 1 F2 – 1 CoF, + 1 Cl2
5. How many molecules of fluorine are required to produce 290.8 g of
cobalt(II)fluoride?

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

56 moles of   lieter in chemistry