Question

How many electrons are in 7.00 g of 13c?

Answer 1

The correct answer is: 1,946 × 10²⁴ electrons

Step-by-step explanation:

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13c is an isotope of Carbon, which has 13 of atomic mass: 13g / mol

We have to transform the mass into moles,

electrons = 7g C * (1 mol / 13 g) * (6,022 × 10²³ atoms / mol) * (6 electrons / atom) = 1,946 × 10²⁴ electrons

The correct answer is: 1,946 × 10²⁴ electrons

Answer 2

13C or C-13 is an isotope of the Carbon element. It has an atomic mass of 13 amu or 13 g/mol. So, we can convert the mass in terms of moles, then moles in terms of atoms using the Avogadro's number. For every 1 atom of C, there are 6 electrons.

7 g C(1 mol/13 g)(6.022×10²³ atoms/mol)(6 electrons/atom) = 1.946×10²⁴ electrons