Question 8 of 10 The half-life of carbon-14 is 5,730 years. If you start with 12 atoms of carbon-
14, how many atoms of carbon-14 will there be after 5,730 years?
A. 12 atoms
B. 3 atoms
ООО
C. 24 atoms
D. 6 atoms
SUBMIT

6

Explanation:

if you start with 12 atoms of carbon and its called the half life of carbon what is half of 12

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%