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lutik1710 [3]
2 years ago
6

Help me please, is for my finals!!

Chemistry
1 answer:
Misha Larkins [42]2 years ago
6 0

Answer: A

Explanation:

9 protons correspond to fluorine.

  • The first model shows 9 electrons, so the charge is neutral and is thus a fluorine atom.
  • The second model shows 10 electrons, so the charge is -1, meaning is a fluoride ion.
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Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reaction:P4(g) + 10 Cl2(g) → 4PCl5(s) ΔH°
miskamm [114]

<u>Answer:</u> The \Delta H^o_{rxn} for the reaction is -1835 kJ.

<u>Explanation:</u>

Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.

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P_4(g)+10Cl_2(g)\rightarrow 4PCl_5(s)      \Delta H^o_{rxn}=?

The intermediate balanced chemical reaction are:

(1) PCl_5(s)\rightarrow PCl_3(g)+Cl_2(g)    \Delta H_1=157kJ   ( × 4)

(2) P_4(g)+6Cl_2(g)\rightarrow 4PCl_3(g)     \Delta H_2=-1207kJ

The expression for enthalpy of the reaction follows:

\Delta H^o_{rxn}=[4\times (-\Delta H_1)]+[1\times \Delta H_2]

Putting values in above equation, we get:

\Delta H^o_{rxn}=[(4\times (-157))+(1\times (-1207))=-1835kJ

Hence, the \Delta H^o_{rxn} for the reaction is -1835 kJ.

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3 years ago
PLEASE HELP SOMEONE PLEASEEEE
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Answer:

the answer is b

hope this helps you!!

Have a lovely day!

-millie :D

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What quantity is represented by the metric system prefix deci-?
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