Here's how to calculate the mass of 5 moles of carbon-12 (¹²C):

1. Molar Mass of Carbon-12

* The molar mass of carbon-12 is 12.00 g/mol. This means that one mole of ¹²C atoms weighs 12.00 grams.

2. Calculation

* To find the mass of 5 moles of ¹²C, multiply the molar mass by the number of moles:

5 moles * 12.00 g/mol = 60.00 g

Answer: 5 moles of ¹²C weighs 60.00 grams.