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Ivanshal [37]
2 years ago
15

.

Chemistry
2 answers:
DaniilM [7]2 years ago
7 0
The right option is C their force is not at its peak in the middle of the magnet
Debora [2.8K]2 years ago
4 0

Explanation:

Their force of attraction is strongest in the middle of the magnet.

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What is the change in energy ?e of the hydrogen atom as the electron makes the transition from the n=3 energy level to the n=1 e
Contact [7]
The change in energy is is  known as work-energy
5 0
3 years ago
Combustion reactions are exothermic. The heat of reaction for the combustion of 2-methylheptane, C8H18, is 1.306×103 kcal/mol. W
WARRIOR [948]

Answer:

11.45kcal/g

2.612 × 10³ kcal

Explanation:

When a compound burns (combustion) it produces carbon dioxide and water. The combustion of 2-methylheptane can be represented by the following balanced equation:

2 C₈H₁₈ + 25 O₂ ⇄ 16 CO₂ + 18 H₂O

It releases  1.306 × 10³ kcal every 1 mol of C₈H₁₈ that is burned.

<em>What is the heat of combustion for 2-methylheptane in kcal/gram?</em>

We know that the molar mass of C₈H₁₈ is 114.0g/mol. Then, using proportions:

\frac{1.306 \times 10^{3}Kcal}{1mol} .\frac{1mol}{114.0g} =11.45kcal/g

<em>How much heat will be given off if molar quantities of 2-methylheptane react according to the following equation? 2 C₈H₁₈ + 25 O₂ ⇄ 16 CO₂ + 18 H₂O</em>

In this equation we have 2 moles of C₈H₁₈. So,

2mol \times\frac{1.306 \times 10^{3}kcal }{1mol} =2.612\times 10^{3}kcal

3 0
2 years ago
I need the answer to number 4 ☹️ .
Maslowich
C. Grams per Cubic Centimeter
4 0
3 years ago
How to separate a mixture of copper carbonate and iron sulfate
Shtirlitz [24]

Answer:

Pure copper sulphate can be obtained from an impure sample by re-crystallization. The impure sample is dissolved in water, heated and then cooled which then later forms crystals. These copper sulphate crystals are then separated by filtration and drying.

8 0
2 years ago
How many moles are in 60.05 g of carbon
Brrunno [24]

Answer:

moles =60.05/12

moles=5.0041

moles=5(approx)

5 0
2 years ago
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