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kirill115 [55]
3 years ago
5

Susan conducts an experiment five times and gets a solution concentration of 1.9M, 2.1M, 1.8M, 1.9M, and 2.2M. The known concent

ration of the solution is 2.0M. Which of the following are true about Susan's results?
A. They are both accurate and precise

B. They are precise but not accurate

C. They are accurate but not precise

D. They are neither accurate nor precise
Chemistry
1 answer:
4vir4ik [10]3 years ago
5 0
D they are accurate but not preci
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Answer: -105 kJ

Explanation:-

The balanced chemical reaction is,

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The expression for enthalpy change is,

\Delta H=\sum [n\times B.E(reactant)]-\sum [n\times B.E(product)]

\Delta H=[(n_{N_2}\times B.E_{N_2})+(n_{H_2}\times B.E_{H_2}) ]-[(n_{NH_3}\times B.E_{NH_3})]

\Delta H=[(n_{N_2}\times B.E_{N\equiv N})+(n_{H_2}\times B.E_{H-H}) ]-[(n_{NH_3}\times 3\times B.E_{N-H})]

where,

n = number of moles

Now put all the given values in this expression, we get

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Delta H=-105kJ

Therefore, the enthalpy change for this reaction is, -105 kJ

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What are two examples of a soulution?
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Which type of solution are you talking about?
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