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3 years ago

34. The researchers conducting the studies chose to use a

Chemistry

1 answer:

Zinaida [17]3 years ago

7 0

nonporous and impermeable, and therefore incapable of absorbing water.

Explanation:

The researchers made the choice because the plastic is non-porous and impermeable and therefore incapable of absorbing water.

One deterrent to this experiment would have been a material that absorbs water.

Porosity is the void spaces within a material.
Permeability is the inter-connectivity voids created by the pore spaces.
A porous and permeable material will absorb water.
A non-porous and non-permeable material will not absorb water.

Learn more:

Permeable brainly.com/question/1220097

#learnwithBrainly

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When 2.714 g of AX (s) dissolves in 127.4 g of water in a coffee-cup calorimeter the temperature rises from 23.3 °C to 37.1 °C.

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Answer : The enthalpy change for the solution is 166.34 kJ/mol

Explanation :

First we have to calculate the enthalpy change of the reaction.

Formula used :

$\Delta H=mC\Delta T\\\\\Delta H=mC(T_2-T_1)$

where,

$\Delta H$ = change in enthalpy = ?

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Now put all the given values in the above expression, we get:

$\Delta H=mC(T_2-T_1)$

$\Delta H=129.6g\times 4.18J/g.K\times (310.1-296)K=7638.36J$

Now we have to calculate the moles of AX added to water.

$\text{ Moles of }AX=\frac{\text{ Mass of }AX}{\text{ Molar mass of }AX}=\frac{2.714g}{59.1097g/mole}=0.04592moles$

Now we have to calculate the enthalpy change for the solution.

As, 0.04592 moles releases heat = 7638.36 J

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Answer:

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LUCKY_DIMON [66]

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