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lesya692 [45]
3 years ago
12

What is physical evidence

Chemistry
1 answer:
postnew [5]3 years ago
3 0

Answer:

Physical evidence is any and all objects that can establish that a crime has been committed or can provide a link between a crime and its victim or perpetrator. ... Physical evidence aids in the solution of a case, provides an element of the crime, such as fear or force, and proves a theory in the case.

Explanation:

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A sample of 211 g of iron (III) bromide is reacted with
Alisiya [41]

FeBr₃ ⇒ limiting reactant

mol NaBr = 1.428

<h3>Further explanation</h3>

Reaction

2FeBr₃ + 3Na₂S → Fe₂S₃ + 6NaBr

Limiting reactant⇒ smaller ratio (mol divide by coefficient reaction)

  • FeBr₃

211 g of Iron (III) bromide(MW=295,56 g/mol), so mol FeBr₃ :

\tt n=\dfrac{mass}{MW}\\\\n=\dfrac{211}{295,56}\\\\n=0.714

  • Na₂S

186 g of Sodium sulfide(MW=78,0452 g/mol), so mol Na₂S :

\tt n=\dfrac{186}{78.0452}=2.38

Coefficient ratio from the equation FeBr₃ :  Na₂S = 2 : 3, so mol ratio :

\tt FeBr_3\div Na_2S=\dfrac{0.714}{2}\div \dfrac{2.38}{3}=0.357\div 0.793

So  FeBr₃ as a limiting reactant(smaller ratio)

mol NaBr based on limiting reactant (FeBr₃) :

\tt \dfrac{6}{3}\times 0.714=1.428

6 0
3 years ago
ΔH for the formation of CuCl2 from its elements is -220.1 kJ/mol. How many kJ are associated with the formation of 0.30 mole of
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0.3 * - 220.1 = - 66.03kJ
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Suppose that you measured out 3.50g of Na2SO4. how many moles would you have? (show work)​
Ket [755]

Answer:

Na2SO4 is equal to 0.0070401642780093 mole.

Explanation:

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