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kumpel [21]
3 years ago
8

How many Joules of energy are required to boil 350g of water at 100 degrees Celsius?

Chemistry
1 answer:
IrinaVladis [17]3 years ago
3 0

Answer:

Q_{vap}=7.90x10^5J

Explanation:

Hello!

In this case, since this is the vaporization process of water, we need to keep in mind that the enthalpy of vaporization of this compound is 2.256 kJ/g, for 350 g, we obtain:

Q_{vap}=m*\Delta H_{vap}\\\\Q_{vap}=350g*2.256\frac{kJ}{g} *\frac{1000J}{1kJ} \\\\Q_{vap}=7.90x10^5J

Because the process is carried out at 100 °C, the boiling temperature of water, already.

Best regards!

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Determine the pH of a 2.8 ×10−4 M solution<br> of Ca(OH)2.
shepuryov [24]

Answer:

pH = 10.75

Explanation:

To solve this problem, we must find the molarity of [OH⁻]. With the molarity we can find the pOH = -log[OH⁻]

Using the equation:

pH = 14 - pOH

We can find the pH of the solution.

The molarity of Ca(OH)₂ is 2.8x10⁻⁴M, as there are 2 moles of OH⁻ in 1 mole of Ca(OH)₂, the molarity of [OH⁻] is 2*2.8x10⁻⁴M = 5.6x10⁻⁴M

pOH is

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pH = 14-pOH

<h3>pH = 10.75</h3>
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2 years ago
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Answer:

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Explanation:

7 0
2 years ago
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5 0
2 years ago
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svlad2 [7]

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Hitman42 [59]

Answer:

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