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Semmy [17]
2 years ago
7

Could someone please help me with this chemistry question I will mark the correct answer as brainliest

Chemistry
1 answer:
Arisa [49]2 years ago
8 0
It is 95% ethanol and 5%water
I’m pretty sure hope you get it right!
:)
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Organelles_____are specialized structures that carry out particular jobs and functions?
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Cell or cellular

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Explain how the hydrogen ion concentration gradient is generated
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Why is the structure of a molecule important to its function
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3 years ago
Which formula represents an unsaturated hydrocarbon?<br> (1) C5H12 (3) C7H16<br> (2) C6H14 (4) C8H14
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5 0
3 years ago
Read 2 more answers
When 20.0 g of KI are dissolved in 50.0 mL of distilled water in a calorimeter, the temperature drops from 24.0 °C to 19.0 °C. C
Reil [10]
<h2>Answer:</h2>

<em>8.67kJ/mol</em>

<h2>Explanations</h2>

The formula for calculating the amount of heat absorbed by the water is given as:

\begin{gathered} q=mc\triangle t \\ q=50\times4.18\frac{J}{g^oC}\times(19-24) \\ q=50\times4.18\times(-5) \\ q=-1045Joules \\ q=-1.045kJ \end{gathered}

Determine the moles of KI

\begin{gathered} moles\text{ of KI}=\frac{mass\text{ of KI}}{molar\text{ mass of KI}} \\ moles\text{ of KI}=\frac{20g}{166g\text{/mol}} \\ moles\text{ of KI}=0.1205moles \end{gathered}

Since heat is lost, hence the enthalpy change of the solution will be negative that is:

\begin{gathered} \triangle H=-q \\ \triangle H=-(-1.045kJ) \\ \triangle H=1.045kJ \end{gathered}

Determine the enthalpy of solution in kJ•mol-1

\begin{gathered} \triangle H_{diss}=\frac{1.045kJ}{0.1205mole} \\ \triangle H_{diss}\approx8.67kJmol^{-1} \end{gathered}

Hence the enthalpy of solution in kJ•mol-1 for KI is 8.67kJ/mol

4 0
1 year ago
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