We know that density = mass /volume
so
mass=volume*density
volume=mass/density
so c is wrong
The catalyst (4) decreases the activation energy required for a reaction, by holding reactants in place
Answer:
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Explanation:
SORRY
Answer:
(A) endothermic
(A) Yes, absorbed
Explanation:
Let's consider the following thermochemical equation.
2 Fe₂O₃(s) ⇒ 4 FeO(s) + O₂(g) ΔH = 560 kJ
Since ΔH > 0, the reaction is endothermic.
We can establish the following relations:
- 560 kJ are absorbed when 2 moles of Fe₂O₃ react.
- The molar mass of Fe₂O₃ is 160 g/mol.
Suppose 66.6 g of Fe₂O₃ react. The heat absorbed is:

Atoms return to their ground state by emitting a photon of light.