Match the grams of each element or compound to the corresponding number of moles of that element or compound.

1. 10.0 g H
0.0056 moles
2. 0.25 g Na
9.92 moles
3. 1.0 x 102 mg H2O
0.011 moles

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.

i think the answer is terrae but not 100 percent sure. ▓▬▬ §