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strojnjashka [21]
3 years ago
15

Which of the following elements has three valence electrons? (2 points)

Chemistry
1 answer:
il63 [147K]3 years ago
7 0

Answer:

Al

Explanation:

It has 3.

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Determine the moles of chlorine needed to react with 38.9 of iron (III) chloride.
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Answer: 0.360 moles

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}

\text{Moles of} FeCl_3=\frac{38.9g}{162.2g/mol}=0.240moles

The balanced chemical reaction is:

2Fe+3Cl_2\rightarrow 2FeCl_3  

According to stoichiometry :

2 moles of require = 3 moles of

Thus 0.240 moles of FeCl_3 will require=\frac{3}{2}\times 0.240=0.360moles of Cl_2

Thus 0.360 moles of chlorine needed to react to produce 38.9 of iron (III) chloride.

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