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nataly862011 [7]
3 years ago
7

100 g of water (specific heat =4.184J/g) and 100g of a metal sample (specific heat = 0.397 J/g) are heated from 25 to 75. Which

substance required more thermal energy to reach 75? (Explain your reasoning).
Chemistry
1 answer:
Viktor [21]3 years ago
7 0
Q=heat and Q=m*c*dekta(temp)
So we have

Q= 100g*4.184*50=20920J of heat energy

Q= 100g * 0.397* 50= 1985J of heat energy

So the water requires more energy and this is due to the higher heat capacity value of water than the metal sample

Please help me out and rate Brainliest if my answer helped you understand the concept and how to solve!! Any questions please just ask! Thank you so much!!
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Answer:

CH₃CH₂CH₂COOH > CH₃CH₂COOH > ClCH₂CH₂COOH  > ClCH₂COOH

Explanation:

Electron-withdrawing groups (EWGs) increase acidity by inductive removal of electrons from the carboxyl group.

Electron-donating groups (EDGs) decrease acidity by inductive donation of electrons to the carboxyl group.

  • The closer the substituent is to the carboxyl group, the greater is its effect.
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CH₃CH₂-CH₂COOH —  EDG —                         weakest —  pKₐ = 4.82

      CH₃-CH₂COOH — reference —                                     pKₐ = 4.75

  ClCH₂-CH₂COOH — EWG on β-carbon— stronger —     pKₐ = 4.00

           ClCH₂COOH — EWG on α-carbon — strongest —  pKₐ = 2.87

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How many moles are 3.20 x102 formula units of calcium iodide?
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The number of moles in 3.20 x 10² formula units of calcium iodide is 0.053 moles.

<h3>How to calculate number of moles?</h3>

The number of moles in the formula units of a substance is calculated by dividing the formula unit by Avogadro's number.

According to this question, 3.20 x 10² formula units are in calcium iodide. The number of moles is as follows:

no of moles = 3.20 x 10²² ÷ 6.02 × 10²³

no of moles = 0.53 × 10-¹

no of moles = 0.053 moles

Therefore, the number of moles in 3.20 x 10² formula units of calcium iodide is 0.053 moles.

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