Answer:
C. Diamond
Explanation:
Talc is the softest and diamond is the hardest. Each mineral can scratch only those below it on the scale.
M is the unit for concentration (C)
The units for concentration is mol/ L
To find moles you would have to multiply concentration x volume to cancel out the volume and find get moles (n)
For ex:
Moles (n) = C x V (concentration x volume)
N = 1.23 mol/L x 5L (vol. gets cancelled out)
N = 6.15 moles (you get left with moles)
OR to find concentration:
C = 6.15 moles / 5L
C = 1.23 mols/L OR 1.23 M
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
