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Answer:
Five molecules of oxygen.
Explanation:
Hello,
In this case, considering the given chemical reaction, we must write a five before the oxygen in order to equal the number of oxygen atoms at both the right and left side (ten) so phosphorous remain the same (4):
It means that five molecules of oxygen (O₂) are needed to form one molecule of tetraphosphorous decaoxide (P₄O₁₀).
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1, 4, 1, 2, 1
Explanation:
We have the following chemical reaction:
MnO₂ + HCl → MnCl₂ + H₂O + Cl₂
To balance the chemical equation the number of atoms of each element entering the reaction have to be equal to the number of atoms of each element leaving the reaction, in order to conserve the mass.
So the balanced chemical equation is:
MnO₂ + 4 HCl → MnCl₂ + 2 H₂O + Cl₂
Learn more about:
balancing chemical equations
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Hello!
The reaction that took place was
B) exothermic. The equation for the ΔH is
To know if this reaction is
exothermic or
endothermic we will need to look at the
sign of the
ΔH. If it is
positive, it means that enthalpy of the products is
higher than the enthalpy of the reagents and the reaction is
endothermic.
If the sign is negative, it means that the enthalpy of the products is
lower than the enthalpy of the reagents and the reaction is
exothermic. In this case, the sign is negative, so the reaction is exothermic.
Have a nice day!