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zepelin [54]
3 years ago
9

Grace injured her ankle while running a relay race at the family reunion. Her aunt breaks the inner, activator portion of an ins

tant cold pack releasing the solid urea into the surrounding water. How could Grace modify this device to make it colder faster?
A) Expand the volume of the urea in the activator cell.
B) Maximize the overall size and volume of the cold pack.
C) Increase the concentration both main and activator phases.
D) Include a slow release activator solution to increase longevity.
Chemistry
1 answer:
Solnce55 [7]3 years ago
8 0

Answer:

A

Explanation:

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Consider the following reaction at 298 K:
faltersainse [42]

Answer :

\Delta S_{sys} = -1622.8 J/K

\Delta S_{surr} = -94.6 J/K

\Delta S_{univ} = 0 J/K

Explanation :  Given,

\Delta H = -483.6 kJ

The given chemical reaction is:

2H_2(g)+O_2(g)\rightarrow 2H_2O(g)

First we have to calculate the value of \Delta S_{sys}.

\Delta S_{sys}=\frac{\Delta H}{T}

\Delta S_{sys}=\frac{-483.6kJ}{298K}

\Delta S_{sys}=-1.6228kJ/K=-1622.8J/K

Entropy of system = -1622.8 J/K

As we know that:

Entropy of system = -Entropy of surrounding = 1622.8 J/K

and,

Entropy of universe = Entropy of system + Entropy of surrounding

Entropy of universe = -1622.8 J/K + (1622.8 J/K)

Entropy of universe = 0

8 0
3 years ago
Is h20 polar or non polar
katrin [286]

Answer:

polar

Explanation:

3 0
3 years ago
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Stels [109]

Answer:

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5 0
4 years ago
What is the mass of 1.00 mol of oxygen (O2)?
Ad libitum [116K]

Answer:

Mass = 32 g

Explanation:

Given data:

Number of moles of oxygen = 1.0 mol

Mass of oxygen = ?

Solution:

Formula:

Number of moles = mass/molar mass

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by putting values,

1.0 mol = mass/ 32 g/mol

Mass = 1.0 mol ×32 g/mol

Mass = 32 g

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Nataly_w [17]
Physical changes can affect physical properties.

Hoped this helped.

~Bob Ross®

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