Number of moles in 11.82 g gold

atomic mass of gold (Au) = 196

moles = mass/mr

= 11.82/196

=0.06 moles

i believe it is c.) 1575 j.

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.