Question

Question #201b5

Answer 1

`0.538` `"g"` `""^13"C"`

Explanation:

We're asked to find the number of moles of `""^13"C"` that has a mass of `7.00` `"g"`.

Carbon-13 is merely an isotope of carbon, and its isotopic mass is `13.003` `"amu"` (from a source), which means its molar mass is `13.003` `"g/mol"`.

Thus, we use this molar mass when performing our conversion from mass to moles:

`7.00cancel("g"color(white)(l)""^13"C")((1color(white)(l)"mol"color(white)(l)""^13"C")/(13.003cancel("g"color(white)(l)""^13"C"))) = color(red)(ul(0.538color(white)(l)"mol"color(white)(l)""^13"C"`