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solniwko [45]
3 years ago
8

HELP ASAP

Chemistry
2 answers:
evablogger [386]3 years ago
5 0

Answer:

b i think but I'm not 100%

Elodia [21]3 years ago
4 0
It would probably be B
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Calculate the mass of water produced when 5.87 g of butane reacts<br> with excess oxygen.
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Answer:

Explanation:

no. of moles of butane = 5.87g / 58.124 = 0.1009mol

since O2 is excess, limiting reagent is butane

from the equation, 2 moles of butane will reacted to produce water = 10 moles

therefore, 0.1009 moles of butane produced water = (0.1009 x 5) = 0.5050 moles

Weight of H2O formed = 0.5050 x 18.015 = 9.10 grams

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If a reaction is exothermic and its entropy change is positive, which statement is true? If a reaction is exothermic and its ent
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Answer:

  • <em>c. The reaction is spontaneous at all temperatures.</em>

Explanation:

The spontaneity of a reaction can be determined by the thermodynamic property named Gibb's free energy or simply free energy (G).

The change in the free energy of a system is defined as the difference between the increase in enthalpy (ΔH) and the product of the temperature (T) times the increase in entropy (ΔS):

  • ΔG = ΔH - T ΔS

The sign of ΔG tells if a reaction is spontaneous according to this:

  • ΔG < 0, the reaction is spontaneous.
  • ΔG = 0, the reaction is in equilibrium.
  • ΔG > 0, the reaction is not spontaneous.

The question states that a reaction is exothermic, and its entropy change is positive. That means:

  • Exhotermic: ΔH < 0
  • Positive entropy change: ΔS > 0

Remember that the temperature is stated in absolute scale, so T is always positive.

Hence, ΔG = ΔH - T ΔS = (negative) - T (positive) = (negative) + (negative) = negative.

<u>Conclusion</u>: since ΔG is negative, regardless the temperature, you conclude that<em><u> the reaction is spontaneous at all temperatures, which is the option c.</u></em>

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A student analyzes soil samples from her backyard. She organizes the samples into three categories, based on their pH. The three
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Answer: circle graph.

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A circle graph (also known as pie chart) is excellent to visualize the relative size of different sectors. Being the entire circle 100%, each sector will show the percent of each category.

In the given example, the circle will be divided in 3 different sectors, in which the size is proportional to the percent of each one.

In the given case:: 

<span>pH less than 8: 20%
</span><span>
</span><span> pH between 8 and 8.5: 50%,
</span><span>
</span><span>pH greater than 8.5: 30%
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</span><span>
</span><span>So, a sector whose area is 20% will represent the first category, a sector whose area is 50% will represent the second category, and a sector whose area is 30% will represent the third category. The whole circle is 100%, this is the sum of the 3 categories is 100%.
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