Answer:
Radioactive dating
Explanation:
Radioactive dating measures the ratio of C¹²(normal) and C¹⁴ (radioactive) in fossils to determine the exact age of the specimen. C¹⁴ is unstable and has a half life of 5730 years, so as the organism ages the amount of C¹⁴ diminishes but the amount of C¹² remains constant. The ratio of C¹⁴ to C¹² is used to analyze the decay of atomic particles to determine exact age.
Answer:
The answer to your question is: ΔH = -849.5 KJ/mol
Explanation:
Data
ΔH = ?
H Fe2O3 = -825.5 KJ/mol
H Al2O3 = -1675 KJ/mol
H Al = 0 KJ/mol
H Fe = 0 KJ/ mol
Reaction
2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s)
ΔH = H products - H reactants
ΔH = H Al2O3 - H Fe2O3
ΔH = -1675 - (- 825.5)
ΔH = -1675 + 825.5
ΔH = -849.5 KJ/mol
Answer:
Here
Explanation:
When the atom absorbs energy, it can move to a higher energy state, or excited state. Under what circumstances can an atom emit a photon? A photon is emitted when an atom moves from an excited state to its ground state or to a lower-energy excited state.
Answer:
What's that??
Explanation:
Btw thanks for the points!! lol
Answer:
Number of moles = 0.51 mol
Explanation:
Given data:
Mass of CO₂ = 22.4 g
Number of moles = ?
Solution:
Number of moles of CO₂:
Number of moles = mass/molar mass
Molar mass of CO₂ = 44 g/mol
by putting values,
Number of moles = 22.4 g/ 44 g/mol
Number of moles = 0.51 mol
